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<a name="Shell-Builtin-Commands-1"></a>
<h1 class="chapter">17. Shell Builtin Commands</h1>
<a name="index-builtin-commands"></a>
<a name="index-commands_002c-builtin"></a>
<dl compact="compact">
<dt> <tt>-</tt> <var>simple command</var></dt>
<dd><p>See <a href="Shell-Grammar.html#Precommand-Modifiers">Precommand Modifiers</a>.
</p>
<a name="index-_002e"></a>
</dd>
<dt> <tt>.</tt> <var>file</var> [ <var>arg</var> ... ]</dt>
<dd><p>Read commands from <var>file</var> and execute them in the current shell
environment.
</p>
<p>If <var>file</var> does not contain a slash, or if <tt>PATH_DIRS</tt> is set,
the shell looks in the components of <tt>$path</tt> to find the directory
containing <var>file</var>. Files in the current directory are not read
unless ‘<tt>.</tt>’ appears somewhere in <tt>$path</tt>. If a file named
‘<var>file</var><tt>.zwc</tt>’ is found, is newer than <var>file</var>, and is the
compiled form (created with the <tt>zcompile</tt> builtin) of <var>file</var>,
then commands are read from that file instead of <var>file</var>.
</p>
<p>If any arguments <var>arg</var> are given,
they become the positional parameters; the old positional
parameters are restored when the <var>file</var> is done executing.
If <var>file</var> was not found the return status is 127; if <var>file</var> was found
but contained a syntax error the return status is 126; else the return
status is the exit status of the last command executed.
</p>
<a name="index-_003a"></a>
<a name="index-expanding-parameters"></a>
<a name="index-parameters_002c-expanding"></a>
<a name="index-doing-nothing"></a>
</dd>
<dt> <tt>:</tt> [ <var>arg</var> ... ]</dt>
<dd><p>This command does nothing, although normal argument expansions is performed
which may have effects on shell parameters. A zero exit status is returned.
</p>
<a name="index-alias"></a>
<a name="index-aliases_002c-defining"></a>
<a name="index-aliases_002c-listing"></a>
</dd>
<dt> <tt>alias</tt> [ {<tt>+|<tt>-</tt></tt>}<tt>gmrsL</tt> ] [ <var>name</var>[<tt>=</tt><var>value</var>] ... ]</dt>
<dd><p>For each <var>name</var> with a corresponding <var>value</var>, define an alias
with that value. A trailing space in <var>value</var> causes the next word
to be checked for alias expansion. If the <tt>-g</tt> flag is present,
define a global alias; global aliases are expanded even if they do not
occur in command position.
</p>
<p>If the <tt>-s</tt> flags is present, define a suffix alias: if the command
word on a command line is in the form ‘<var>text</var><tt>.</tt><var>name</var>’, where
<var>text</var> is any non-empty string, it is replaced by the text
‘<var>value</var> <var>text</var><tt>.</tt><var>name</var>’. Note that <var>name</var> is treated as
a literal string, not a pattern. A trailing space in <var>value</var> is not
special in this case. For example,
</p>
<table><tr><td> </td><td><pre class="example">alias -s ps=gv
</pre></td></tr></table>
<p>will cause the command ‘<tt>*.ps</tt>’ to be expanded to ‘<tt>gv *.ps</tt>’. As
alias expansion is carried out earlier than globbing, the ‘<tt>*.ps</tt>’ will
then be expanded. Suffix aliases constitute a different name space from
other aliases (so in the above example it is still possible
to create an alias for the command <tt>ps</tt>) and the two sets are never
listed together.
</p>
<p>For each <var>name</var> with no <var>value</var>,
print the value of <var>name</var>, if any. With no arguments, print all
currently defined aliases other than suffix aliases. If the <tt>-m</tt> flag
is given the arguments are taken as patterns (they should be quoted to
preserve them from being interpreted as glob patterns), and the aliases
matching these patterns are printed. When printing aliases and one of
the <tt>-g</tt>, <tt>-r</tt> or <tt>-s</tt> flags is present, restrict the printing to
global, regular or suffix aliases, respectively; a regular alias is one
which is neither a global nor a suffix alias. Using ‘<tt>+</tt>’
instead of ‘<tt>-</tt>’, or ending the option list with a single
‘<tt>+</tt>’, prevents the values of the aliases from being printed.
</p>
<p>If the <tt>-L</tt> flag is present, then print each
alias in a manner suitable for putting in a startup script. The exit
status is nonzero if a <var>name</var> (with no <var>value</var>) is given for
which no alias has been defined.
</p>
<p>For more on aliases, include common problems,
<a href="Shell-Grammar.html#Aliasing">Aliasing</a>.
</p>
<a name="index-autoload"></a>
<a name="index-functions_002c-autoloading-1"></a>
<a name="index-autoloading-functions-1"></a>
</dd>
<dt> <tt>autoload</tt> [ {<tt>+</tt>|<tt>-</tt>}<tt>UXkmtz</tt> ] [ <tt>-w</tt> ] [ <var>name</var> ... ]</dt>
<dd><p>Equivalent to <tt>functions -u</tt>, with the exception of <tt>-X</tt>/<tt>+X</tt> and
<tt>-w</tt>.
</p>
<p>The flag <tt>-X</tt> may be used only inside a shell function, and may not be
followed by a <var>name</var>. It causes the calling function to be marked for
autoloading and then immediately loaded and executed, with the current
array of positional parameters as arguments. This replaces the previous
definition of the function. If no function definition is found, an error
is printed and the function remains undefined and marked for autoloading.
</p>
<p>The flag <tt>+X</tt> attempts to load each <var>name</var> as an autoloaded function,
but does <em>not</em> execute it. The exit status is zero (success) if the
function was not previously defined <em>and</em> a definition for it was found.
This does <em>not</em> replace any existing definition of the function. The
exit status is nonzero (failure) if the function was already defined or
when no definition was found. In the latter case the function remains
undefined and marked for autoloading. If ksh-style autoloading is
enabled, the function created will contain the contents of the file
plus a call to the function itself appended to it, thus giving normal
ksh autoloading behaviour on the first call to the function.
If the <tt>-m</tt> flag is also given each <var>name</var> is treated as a
pattern and all functions already marked for autoload that match the
pattern are loaded.
</p>
<p>With the <tt>-w</tt> flag, the <var>name</var>s are taken as names of files compiled
with the <tt>zcompile</tt> builtin, and all functions defined in them are
marked for autoloading.
</p>
<p>The flags <tt>-z</tt> and <tt>-k</tt> mark the function to be autoloaded using the
zsh or ksh style, as if the option <tt>KSH_AUTOLOAD</tt> were unset or were
set, respectively. The flags override the setting of the option at the
time the function is loaded.
</p>
<p>Note that the <tt>autoload</tt> command makes no attempt to ensure the
shell options set during the loading or execution of the file have
any particular value. For this, the <tt>emulate</tt> command can be used:
</p>
<table><tr><td> </td><td><pre class="example">emulate zsh -c 'autoload -Uz <var>func</var>'
</pre></td></tr></table>
<p>arranges that when <var>func</var> is loaded the shell is in native <tt>zsh</tt>
emulation, and this emulation is also applied when <var>func</var> is run.
</p>
<a name="index-bg"></a>
<a name="index-jobs_002c-backgrounding"></a>
</dd>
<dt> <tt>bg</tt> [ <var>job</var> ... ]</dt>
<dt> <var>job</var> ... <tt>&</tt></dt>
<dd><p>Put each specified <var>job</var> in the background,
or the current job if none is specified.
</p>
</dd>
<dt> <tt>bindkey</tt></dt>
<dd><p>See <a href="Zsh-Line-Editor.html#Zle-Builtins">Zle Builtins</a>.
</p>
<a name="index-break"></a>
<a name="index-exiting-loops"></a>
<a name="index-loops_002c-exiting"></a>
</dd>
<dt> <tt>break</tt> [ <var>n</var> ]</dt>
<dd><p>Exit from an enclosing <tt>for</tt>, <tt>while</tt>,
<tt>until</tt>, <tt>select</tt> or <tt>repeat</tt> loop. If <var>n</var>
is specified, then break <var>n</var> levels instead of just one.
</p>
<a name="index-builtin-1"></a>
</dd>
<dt> <tt>builtin</tt> <var>name</var> [ <var>args</var> ... ]</dt>
<dd><p>Executes the builtin <var>name</var>, with the given <var>args</var>.
</p>
<a name="index-bye"></a>
</dd>
<dt> <tt>bye</tt></dt>
<dd><p>Same as <tt>exit</tt>.
</p>
</dd>
<dt> <tt>cap</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fcap-Module">The zsh/cap Module</a>.
</p>
<a name="index-cd"></a>
<a name="index-directories_002c-changing"></a>
</dd>
<dt> <tt>cd</tt> [ <tt>-qsLP</tt> ] [ <var>arg</var> ]</dt>
<dt> <tt>cd</tt> [ <tt>-qsLP</tt> ] <var>old</var> <var>new</var></dt>
<dt> <tt>cd</tt> [ <tt>-qsLP</tt> ] {<tt>+</tt>|<tt>-</tt>}<var>n</var></dt>
<dd><p>Change the current directory. In the first form, change the
current directory to <var>arg</var>, or to the value of <tt>$HOME</tt> if
<var>arg</var> is not specified. If <var>arg</var> is ‘<tt>-</tt>’, change to the
previous directory.
</p>
<p>Otherwise, if <var>arg</var> begins with a slash, attempt to change to the
directory given by <var>arg</var>.
</p>
<p>If <var>arg</var> does not begin with a slash, the behaviour depends on whether
the current directory ‘<tt>.</tt>’ occurs in the list of directories contained
in the shell parameter <tt>cdpath</tt>. If it does not, first attempt to change
to the directory <var>arg</var> under the current directory, and if that fails
but <tt>cdpath</tt> is set and contains at least one element attempt to change
to the directory <var>arg</var> under each component of <tt>cdpath</tt> in turn until
successful. If ‘<tt>.</tt>’ occurs in <tt>cdpath</tt>, then <tt>cdpath</tt> is searched
strictly in order so that ‘<tt>.</tt>’ is only tried at the appropriate point.
</p>
<p>The order of testing <tt>cdpath</tt> is modified if the option <tt>POSIX_CD</tt>
is set, as described in the documentation for the option.
</p>
<p>If no directory is found, the option <tt>CDABLE_VARS</tt> is set, and a
parameter named <var>arg</var> exists whose value begins with a slash, treat its
value as the directory. In that case, the parameter is added to the named
directory hash table.
</p>
<p>The second form of <tt>cd</tt> substitutes the string <var>new</var>
for the string <var>old</var> in the name of the current directory,
and tries to change to this new directory.
</p>
<p>The third form of <tt>cd</tt> extracts an entry from the directory
stack, and changes to that directory. An argument of the form
‘<tt>+</tt><var>n</var>’ identifies a stack entry by counting from the left
of the list shown by the <tt>dirs</tt> command, starting with zero.
An argument of the form ‘<tt>-</tt><var>n</var>’ counts from the right.
If the <tt>PUSHD_MINUS</tt> option is set, the meanings of ‘<tt>+</tt>’
and ‘<tt>-</tt>’ in this context are swapped.
</p>
<p>If the <tt>-q</tt> (quiet) option is specified, the hook function <tt>chpwd</tt>
and the functions in the array <tt>chpwd_functions</tt> are not called.
This is useful for calls to <tt>cd</tt> that do not change the environment
seen by an interactive user.
</p>
<p>If the <tt>-s</tt> option is specified, <tt>cd</tt> refuses to change the current
directory if the given pathname contains symlinks. If the <tt>-P</tt> option
is given or the <tt>CHASE_LINKS</tt> option is set, symbolic links are resolved
to their true values. If the <tt>-L</tt> option is given symbolic links are
retained in the directory (and not resolved) regardless of the state of
the <tt>CHASE_LINKS</tt> option.
</p>
<a name="index-chdir"></a>
</dd>
<dt> <tt>chdir</tt></dt>
<dd><p>Same as <tt>cd</tt>.
</p>
</dd>
<dt> <tt>clone</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fclone-Module">The zsh/clone Module</a>.
</p>
<a name="index-command-1"></a>
</dd>
<dt> <tt>command</tt> [ <tt>-pvV</tt> ] <var>simple command</var></dt>
<dd><p>The simple command argument is taken as an external command instead of
a function or builtin and is executed. If the <tt>POSIX_BUILTINS</tt> option
is set, builtins will also be executed but certain special properties
of them are suppressed. The <tt>-p</tt> flag causes a default path to be
searched instead of that in <tt>$path</tt>. With the <tt>-v</tt> flag, <tt>command</tt>
is similar to <tt>whence</tt> and with <tt>-V</tt>, it is equivalent to <tt>whence
-v</tt>.
</p>
<p>See also <a href="Shell-Grammar.html#Precommand-Modifiers">Precommand Modifiers</a>.
</p>
</dd>
<dt> <tt>comparguments</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fcomputil-Module">The zsh/computil Module</a>.
</p>
</dd>
<dt> <tt>compcall</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fcompctl-Module">The zsh/compctl Module</a>.
</p>
</dd>
<dt> <tt>compctl</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fcompctl-Module">The zsh/compctl Module</a>.
</p>
</dd>
<dt> <tt>compdescribe</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fcomputil-Module">The zsh/computil Module</a>.
</p>
</dd>
<dt> <tt>compfiles</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fcomputil-Module">The zsh/computil Module</a>.
</p>
</dd>
<dt> <tt>compgroups</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fcomputil-Module">The zsh/computil Module</a>.
</p>
</dd>
<dt> <tt>compquote</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fcomputil-Module">The zsh/computil Module</a>.
</p>
</dd>
<dt> <tt>comptags</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fcomputil-Module">The zsh/computil Module</a>.
</p>
</dd>
<dt> <tt>comptry</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fcomputil-Module">The zsh/computil Module</a>.
</p>
</dd>
<dt> <tt>compvalues</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fcomputil-Module">The zsh/computil Module</a>.
</p>
<a name="index-continue"></a>
<a name="index-loops_002c-continuing"></a>
<a name="index-continuing-loops"></a>
</dd>
<dt> <tt>continue</tt> [ <var>n</var> ]</dt>
<dd><p>Resume the next iteration of the enclosing
<tt>for</tt>, <tt>while</tt>, <tt>until</tt>, <tt>select</tt> or
<tt>repeat</tt> loop. If <var>n</var> is specified, break out of
<var>n</var>-1 loops and resume at the <var>n</var>th enclosing loop.
</p>
<a name="index-declare"></a>
</dd>
<dt> <tt>declare</tt></dt>
<dd><p>Same as <tt>typeset</tt>.
</p>
<a name="index-dirs"></a>
<a name="index-directory-stack_002c-printing"></a>
</dd>
<dt> <tt>dirs</tt> [ <tt>-c</tt> ] [ <var>arg</var> ... ]</dt>
<dt> <tt>dirs</tt> [ <tt>-lpv</tt> ]</dt>
<dd><p>With no arguments, print the contents of the directory stack.
Directories are added to this stack with the <tt>pushd</tt> command,
and removed with the <tt>cd</tt> or <tt>popd</tt> commands.
If arguments are specified, load them onto the directory stack,
replacing anything that was there, and push the current directory
onto the stack.
</p>
<dl compact="compact">
<dt> <tt>-c</tt></dt>
<dd><p>clear the directory stack.
</p>
</dd>
<dt> <tt>-l</tt></dt>
<dd><p>print directory names in full instead of using of using <tt>~</tt> expressions.
</p>
</dd>
<dt> <tt>-p</tt></dt>
<dd><p>print directory entries one per line.
</p>
</dd>
<dt> <tt>-v</tt></dt>
<dd><p>number the directories in the stack when printing.
</p>
</dd>
</dl>
<a name="index-disable"></a>
<a name="index-disabling-commands"></a>
<a name="index-commands_002c-disabling"></a>
</dd>
<dt> <tt>disable</tt> [ <tt>-afmrs</tt> ] <var>name</var> ...</dt>
<dd><p>Temporarily disable the <var>name</var>d hash table elements. The default
is to disable builtin commands. This allows you to use an external
command with the same name as a builtin command. The <tt>-a</tt> option
causes <tt>disable</tt> to act on regular or global aliases. The <tt>-s</tt>
option causes <tt>disable</tt> to act on suffix aliases. The <tt>-f</tt> option causes
<tt>disable</tt> to act on shell functions. The <tt>-r</tt> options causes
<tt>disable</tt> to act on reserved words. Without arguments all disabled
hash table elements from the corresponding hash table are printed.
With the <tt>-m</tt> flag the arguments are taken as patterns (which should be
quoted to prevent them from undergoing filename expansion), and all hash
table elements from the corresponding hash table matching these patterns
are disabled. Disabled objects can be enabled with the <tt>enable</tt>
command.
</p>
<a name="index-disown"></a>
<a name="index-jobs_002c-disowning-1"></a>
</dd>
<dt> <tt>disown</tt> [ <var>job</var> ... ]</dt>
<dt> <var>job</var> ... <tt>&|</tt></dt>
<dt> <var>job</var> ... <tt>&!</tt></dt>
<dd><p>Remove the specified <var>job</var>s from the job table; the shell will
no longer report their status, and will not complain if you
try to exit an interactive shell with them running or stopped.
If no <var>job</var> is specified, disown the current job.
</p>
<p>If the <var>job</var>s are currently stopped and the <tt>AUTO_CONTINUE</tt> option
is not set, a warning is printed containing information about how to
make them running after they have been disowned. If one of the latter
two forms is used, the <var>job</var>s will automatically be made running,
independent of the setting of the <tt>AUTO_CONTINUE</tt> option.
</p>
<a name="index-echo"></a>
</dd>
<dt> <tt>echo</tt> [ <tt>-neE</tt> ] [ <var>arg</var> ... ]</dt>
<dd><p>Write each <var>arg</var> on the standard output, with a space separating
each one.
If the <tt>-n</tt> flag is not present, print a newline at the end.
<tt>echo</tt> recognizes the following escape sequences:
</p>
<dl compact="compact">
<dt> <tt>\a</tt></dt>
<dd><p>bell character
</p></dd>
<dt> <tt>\b</tt></dt>
<dd><p>backspace
</p></dd>
<dt> <tt>\c</tt></dt>
<dd><p>suppress final newline
</p></dd>
<dt> <tt>\e</tt></dt>
<dd><p>escape
</p></dd>
<dt> <tt>\f</tt></dt>
<dd><p>form feed
</p></dd>
<dt> <tt>\n</tt></dt>
<dd><p>linefeed (newline)
</p></dd>
<dt> <tt>\r</tt></dt>
<dd><p>carriage return
</p></dd>
<dt> <tt>\t</tt></dt>
<dd><p>horizontal tab
</p></dd>
<dt> <tt>\v</tt></dt>
<dd><p>vertical tab
</p></dd>
<dt> <tt>\\</tt></dt>
<dd><p>backslash
</p></dd>
<dt> <tt>\0</tt><var>NNN</var></dt>
<dd><p>character code in octal
</p></dd>
<dt> <tt>\x</tt><var>NN</var></dt>
<dd><p>character code in hexadecimal
</p></dd>
<dt> <tt>\u</tt><var>NNNN</var></dt>
<dd><p>unicode character code in hexadecimal
</p></dd>
<dt> <tt>\U</tt><var>NNNNNNNN</var></dt>
<dd><p>unicode character code in hexadecimal
</p></dd>
</dl>
<a name="index-BSD_005fECHO_002c-use-of"></a>
<p>The <tt>-E</tt> flag, or the <tt>BSD_ECHO</tt> option, can be used to disable
these escape sequences. In the latter case, <tt>-e</tt> flag can be used to
enable them.
</p>
</dd>
<dt> <tt>echotc</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002ftermcap-Module">The zsh/termcap Module</a>.
</p>
</dd>
<dt> <tt>echoti</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fterminfo-Module">The zsh/terminfo Module</a>.
</p>
<a name="index-emulate"></a>
<a name="index-compatibility_002c-sh"></a>
<a name="index-compatibility_002c-ksh"></a>
<a name="index-compatibility_002c-csh"></a>
<a name="index-sh_002c-compatibility"></a>
<a name="index-ksh_002c-compatibility"></a>
<a name="index-csh_002c-compatibility"></a>
</dd>
<dt> <tt>emulate</tt> [ <tt>-LR</tt> ] [ {<tt>zsh</tt>|<tt>sh</tt>|<tt>ksh</tt>|<tt>csh</tt>} [ <var>flags</var> ... ] ]</dt>
<dd><p>Without any argument print current emulation mode.
</p>
<p>With single argument set up zsh options to emulate the specified shell
as much as possible.
<cite>csh</cite> will never be fully emulated.
If the argument is not one of the shells listed above, <tt>zsh</tt>
will be used as a default; more precisely, the tests performed on the
argument are the same as those used to determine the emulation at startup
based on the shell name, see
<a href="Invocation.html#Compatibility">Compatibility</a>
.
</p>
<p>If the <tt>emulate</tt> command occurs inside a function that has been
marked for execution tracing with <tt>functions -t</tt> then the <tt>xtrace</tt>
option will be turned on regardless of emulation mode or other options.
Note that code executed inside the function by the <tt>.</tt>, <tt>source</tt>, or
<tt>eval</tt> commands is not considered to be running directly from the
function, hence does not provoke this behaviour.
</p>
<p>If the <tt>-R</tt> switch is given, all settable options
are reset to their default value corresponding to the specified emulation
mode, except for certain options describing the interactive
environment; otherwise, only those options likely to cause portability
problems in scripts and functions are altered. If the <tt>-L</tt> switch is given,
the options <tt>LOCAL_OPTIONS</tt> and <tt>LOCAL_TRAPS</tt> will be set as
well, causing the effects of the <tt>emulate</tt> command and any <tt>setopt</tt> and
<tt>trap</tt> commands to be local to the immediately surrounding shell
function, if any; normally these options are turned off in all emulation
modes except <tt>ksh</tt>. The <tt>-L</tt> switch is mutually exclusive with the
use of <tt>-c</tt> in <var>flags</var>.
</p>
<p>The <var>flags</var> may be any of the invocation-time flags described in
<a href="Invocation.html#Invocation">Invocation</a>,
except that ‘<tt>-o EMACS</tt>’ and ‘<tt>-o VI</tt>’ may not be used. Flags such
as ‘<tt>+r</tt>’/‘<tt>+o RESTRICTED</tt>’ may be prohibited in some circumstances.
</p>
<p>If <tt>-c</tt> <var>arg</var> appears in <var>flags</var>, <var>arg</var> is evaluated while the
requested emulation is temporarily in effect. In this case the emulation
mode and all options are restored to their previous values before
<tt>emulate</tt> returns. The <tt>-R</tt> switch may precede the name of the shell
to emulate; note this has a meaning distinct from including <tt>-R</tt> in
<var>flags</var>.
</p>
<p>Use of <tt>-c</tt> enables ‘sticky’ emulation mode for functions defined
within the evaluated expression: the emulation mode is associated
thereafter with the function so that whenever the function is executed
the emulation (respecting the <tt>-R</tt> switch, if present) and all
options are set before entry to the function, and restored after exit.
If the function is called when the sticky emulation is already in
effect, either within an ‘<tt>emulate</tt> <var>shell</var> <tt>-c</tt>’ expression or
within another function with the same sticky emulation, entry and exit
from the function do not cause options to be altered (except due to
standard processing such as the <tt>LOCAL_OPTIONS</tt> option). This also
applies to functions marked for autoload within the sticky emulation;
the appropriate set of options will be applied at the point the
function is loaded as well as when it is run.
</p>
<p>For example:
</p>
<table><tr><td> </td><td><pre class="example">emulate sh -c 'fni() { setopt cshnullglob; }
fno() { fni; }'
fno
</pre></td></tr></table>
<p>The two functions <tt>fni</tt> and <tt>fno</tt> are defined with sticky <tt>sh</tt>
emulation. <tt>fno</tt> is then executed, causing options associated
with emulations to be set to their values in <tt>sh</tt>. <tt>fni</tt> then
calls <tt>fno</tt>; because <tt>fno</tt> is also marked for sticky <tt>sh</tt>
emulation, no option changes take place on entry to or exit from it.
Hence the option <tt>cshnullglob</tt>, turned off by <tt>sh</tt> emulation, will
be turned on within <tt>fni</tt> and remain on on return to <tt>fno</tt>. On exit
from <tt>fno</tt>, the emulation mode and all options will be restored to the
state they were in before entry to the temporary emulation.
</p>
<p>The documentation above is typically sufficient for the intended
purpose of executing code designed for other shells in a suitable
environment. More detailed rules follow.
</p><dl compact="compact">
<dt> 1.</dt>
<dd><p>The sticky emulation environment provided by ‘<tt>emulate</tt>
<var>shell</var> <tt>-c</tt>’ is identical to that provided by entry to
a function marked for sticky emulation as a consequence of being
defined in such an environment. Hence, for example, the sticky
emulation is inherited by subfunctions defined within functions
with sticky emulation.
</p></dd>
<dt> 2.</dt>
<dd><p>No change of options takes place on entry to or exit from
functions that are not marked for sticky emulation, other than those
that would normally take place, even if those functions are called
within sticky emulation.
</p></dd>
<dt> 3.</dt>
<dd><p>No special handling is provided for functions marked for
<tt>autoload</tt> nor for functions present in wordcode created by
the <tt>zcompile</tt> command.
</p></dd>
<dt> 4.</dt>
<dd><p>The presence or absence of the <tt>-R</tt> switch to <tt>emulate</tt>
corresponds to different sticky emulation modes, so for example
‘<tt>emulate sh -c</tt>’, ‘<tt>emulate -R sh -c</tt>’ and ‘<tt>emulate csh -c</tt>’
are treated as three distinct sticky emulations.
</p></dd>
<dt> 5.</dt>
<dd><p>Difference in shell options supplied in addition to the
basic emulation also mean the sticky emulations are different, so for
example ‘<tt>emulate zsh -c</tt>’ and ‘<tt>emulate zsh -o cbases -c</tt>’ are
treated as distinct sticky emulations.
</p></dd>
</dl>
<a name="index-enable"></a>
<a name="index-enabling-commands"></a>
<a name="index-commands_002c-enabling"></a>
</dd>
<dt> <tt>enable</tt> [ <tt>-afmrs</tt> ] <var>name</var> ...</dt>
<dd><p>Enable the <var>name</var>d hash table elements, presumably disabled
earlier with <tt>disable</tt>. The default is to enable builtin commands.
The <tt>-a</tt> option causes <tt>enable</tt> to act on regular or global aliases.
The <tt>-s</tt> option causes <tt>enable</tt> to act on suffix aliases.
The <tt>-f</tt> option causes <tt>enable</tt> to act on shell functions. The <tt>-r</tt>
option causes <tt>enable</tt> to act on reserved words. Without arguments
all enabled hash table elements from the corresponding hash table are
printed. With the <tt>-m</tt> flag the arguments are taken as patterns
(should be quoted) and all hash table elements from the corresponding
hash table matching these patterns are enabled. Enabled objects can be
disabled with the <tt>disable</tt> builtin command.
</p>
<a name="index-eval"></a>
<a name="index-evaluating-arguments-as-commands"></a>
</dd>
<dt> <tt>eval</tt> [ <var>arg</var> ... ]</dt>
<dd><p>Read the arguments as input to the shell and execute the resulting
command(s) in the current shell process. The return status is
the same as if the commands had been executed directly by the shell;
if there are no <var>args</var> or they contain no commands (i.e. are
an empty string or whitespace) the return status is zero.
</p>
</dd>
<dt> <tt>exec</tt> [ <tt>-cl</tt> ] [ <tt>-a</tt> <var>argv0</var> ] <var>simple command</var></dt>
<dd><p>Replace the current shell with an external command rather than forking.
With <tt>-c</tt> clear the environment; with <tt>-l</tt> prepend <tt>-</tt> to the
<tt>argv[0]</tt> string of the command executed (to simulate a login shell);
with <tt>-a</tt> <var>argv0</var> set the <tt>argv[0]</tt> string of the command
executed. See <a href="Shell-Grammar.html#Precommand-Modifiers">Precommand Modifiers</a>.
</p>
<a name="index-exit"></a>
</dd>
<dt> <tt>exit</tt> [ <var>n</var> ]</dt>
<dd><p>Exit the shell with the exit status specified by <var>n</var>; if none
is specified, use the exit status from the last command executed.
<a name="index-IGNORE_005fEOF_002c-use-of"></a>
An EOF condition will also cause the shell to exit, unless
the <tt>IGNORE_EOF</tt> option is set.
</p>
<a name="index-export"></a>
</dd>
<dt> <tt>export</tt> [ <var>name</var>[<tt>=</tt><var>value</var>] ... ]</dt>
<dd><p>The specified <var>name</var>s are marked for automatic export
to the environment of subsequently executed commands.
Equivalent to <tt>typeset -gx</tt>.
If a parameter specified does not
already exist, it is created in the global scope.
</p>
<a name="index-false"></a>
<a name="index-doing-nothing_002c-unsuccessfully"></a>
</dd>
<dt> <tt>false</tt> [ <var>arg</var> ... ]</dt>
<dd><p>Do nothing and return an exit status of 1.
</p>
<a name="index-fc"></a>
<a name="index-history_002c-editing"></a>
<a name="index-editing-history"></a>
</dd>
<dt> <tt>fc</tt> [ <tt>-e</tt> <var>ename</var> ] [ <tt>-m</tt> <var>match</var> ] [ <var>old</var><tt>=</tt><var>new</var> ... ] [ <var>first</var> [ <var>last</var> ] ]</dt>
<dt> <tt>fc</tt> <tt>-l</tt> [ <tt>-nrdfEiD</tt> ] [ <tt>-t</tt> <var>timefmt</var> ] [ <tt>-m</tt> <var>match</var> ]</dt>
<dt> [ <var>old</var><tt>=</tt><var>new</var> ... ] [ <var>first</var> [ <var>last</var> ] ]</dt>
<dt> <tt>fc</tt> <tt>-p</tt> [ <tt>-a</tt> ] [ <var>filename</var> [ <var>histsize</var> [ <var>savehistsize</var> ] ] ]</dt>
<dt> <tt>fc</tt> <tt>-P</tt></dt>
<dt> <tt>fc</tt> <tt>-ARWI</tt> [ <var>filename</var> ]</dt>
<dd><p>Select a range of commands from <var>first</var> to <var>last</var> from the
history list.
The arguments <var>first</var> and <var>last</var> may be specified as a
number or as a string. A negative number is used as an offset
to the current history event number.
A string specifies the most recent event beginning with the given string.
All substitutions <var>old</var><tt>=</tt><var>new</var>, if any, are then performed
on the commands.
</p>
<p>If the <tt>-l</tt> flag is given, the resulting commands are listed on
standard output.
If the <tt>-m</tt> flag is also given the first argument is taken as a
pattern (should be quoted) and only the history events matching this
pattern will be shown.
Otherwise the editor program <var>ename</var> is invoked on a file containing
these history events. If <var>ename</var> is not given, the value
of the parameter <tt>FCEDIT</tt> is used; if that is not set the value of the
parameter <tt>EDITOR</tt> is used; if that is not set a builtin default, usually
‘<tt>vi</tt>’ is used. If <var>ename</var> is ‘<tt>-</tt>’,
no editor is invoked. When editing is complete, the edited
command is executed.
</p>
<p>If <var>first</var> is not specified, it will be set to -1 (the most recent
event), or to -16 if the <tt>-l</tt> flag is given.
If <var>last</var> is not specified, it will be set to <var>first</var>,
or to -1 if the <tt>-l</tt> flag is given.
</p>
<p>The flag <tt>-r</tt> reverses the order of the commands and the
flag <tt>-n</tt> suppresses command numbers when listing.
</p>
<p>Also when listing,
</p><dl compact="compact">
<dt> <tt>-d</tt></dt>
<dd><p>prints timestamps for each command
</p></dd>
<dt> <tt>-f</tt></dt>
<dd><p>prints full time-date stamps in the US
‘<var>MM</var><tt>/</tt><var>DD</var><tt>/</tt><var>YY</var> <var>hh</var>:<var>mm</var>’ format
</p></dd>
<dt> <tt>-E</tt></dt>
<dd><p>prints full time-date stamps in the European
‘<var>dd</var><tt>.</tt><var>mm</var><tt>.</tt><var>yyyy</var> <var>hh</var>:<var>mm</var>’ format
</p></dd>
<dt> <tt>-i</tt></dt>
<dd><p>prints full time-date stamps in ISO8601
‘<var>yyyy</var><tt>-</tt><var>mm</var><tt>-</tt><var>dd</var> <var>hh</var>:<var>mm</var>’ format
</p></dd>
<dt> <tt>-t</tt> <var>fmt</var></dt>
<dd><p>prints time and date stamps in the given format;
<var>fmt</var> is formatted with the strftime function with the zsh extensions
described for the <tt>%D{</tt><var>string</var><tt>}</tt> prompt format in
<a href="Prompt-Expansion.html#Prompt-Expansion">Prompt Expansion</a>. The resulting formatted string must be
no more than 256 characters or will not be printed.
</p>
</dd>
<dt> <tt>-D</tt></dt>
<dd><p>prints elapsed times; may be combined with one of the
options above.
</p></dd>
</dl>
<a name="index-history_002c-stack"></a>
<a name="index-stack_002c-history"></a>
<p>‘<tt>fc -p</tt>’ pushes the current history list onto a stack and switches to a
new history list. If the <tt>-a</tt> option is also specified, this history list
will be automatically popped when the current function scope is exited, which
is a much better solution than creating a trap function to call ‘<tt>fc -P</tt>’
manually. If no arguments are specified, the history list is left empty,
<tt>$HISTFILE</tt> is unset, and <tt>$HISTSIZE</tt> & <tt>$SAVEHIST</tt> are set to their
default values. If one argument is given, <tt>$HISTFILE</tt> is set to that
filename, <tt>$HISTSIZE</tt> & <tt>$SAVEHIST</tt> are left unchanged, and the history
file is read in (if it exists) to initialize the new list. If a second
argument is specified, <tt>$HISTSIZE</tt> & <tt>$SAVEHIST</tt> are instead set to the
single specified numeric value. Finally, if a third argument is specified,
<tt>$SAVEHIST</tt> is set to a separate value from <tt>$HISTSIZE</tt>. You are free to
change these environment values for the new history list however you desire
in order to manipulate the new history list.
</p>
<p>‘<tt>fc -P</tt>’ pops the history list back to an older list saved by ‘<tt>fc -p</tt>’.
The current list is saved to its <tt>$HISTFILE</tt> before it is destroyed
(assuming that <tt>$HISTFILE</tt> and <tt>$SAVEHIST</tt> are set appropriately, of
course). The values of <tt>$HISTFILE</tt>, <tt>$HISTSIZE</tt>, and <tt>$SAVEHIST</tt> are
restored to the values they had when ‘<tt>fc -p</tt>’ was called. Note that this
restoration can conflict with making these variables "local", so your best
bet is to avoid local declarations for these variables in functions that use
‘<tt>fc -p</tt>’. The one other guaranteed-safe combination is declaring these
variables to be local at the top of your function and using the automatic
option (<tt>-a</tt>) with ‘<tt>fc -p</tt>’. Finally, note that it is legal to manually
pop a push marked for automatic popping if you need to do so before the
function exits.
</p>
<a name="index-history_002c-file"></a>
<a name="index-file_002c-history"></a>
<p>‘<tt>fc -R</tt>’ reads the history from the given file,
‘<tt>fc -W</tt>’ writes the history out to the given file,
and ‘<tt>fc -A</tt>’ appends the history out to the given file.
If no filename is specified, the <tt>$HISTFILE</tt> is assumed.
If the <tt>-I</tt> option is added to <tt>-R</tt>, only those events that are
not already contained within the internal history list are added.
If the <tt>-I</tt> option is added to <tt>-A</tt> or <tt>-W</tt>, only those
events that are new since last incremental append/write to
the history file are appended/written.
In any case, the created file will have no more than <tt>$SAVEHIST</tt>
entries.
</p>
<a name="index-fg"></a>
<a name="index-jobs_002c-foregrounding"></a>
<a name="index-jobs_002c-resuming"></a>
</dd>
<dt> <tt>fg</tt> [ <var>job</var> ... ]</dt>
<dt> <var>job</var> ...</dt>
<dd><p>Bring each specified <var>job</var> in turn to the foreground.
If no <var>job</var> is specified, resume the current job.
</p>
<a name="index-float"></a>
</dd>
<dt> <tt>float</tt> [ {<tt>+</tt>|<tt>-</tt>}<tt>EFHghlprtux</tt> ] [ <tt>-LRZ</tt> [ <var>n</var> ]] [ <var>name</var>[<tt>=</tt><var>value</var>] ... ]</dt>
<dd><p>Equivalent to <tt>typeset -E</tt>, except that options irrelevant to floating
point numbers are not permitted.
</p>
<a name="index-functions-1"></a>
</dd>
<dt> <tt>functions</tt> [ {<tt>+</tt>|<tt>-</tt>}<tt>UXkmtTuz</tt> ] [ <var>name</var> ... ]</dt>
<dt> <tt>functions -M</tt> <var>mathfn</var> [ <var>min</var> [ <var>max</var> [ <var>shellfn</var> ] ] ]</dt>
<dt> <tt>functions -M</tt> [ <tt>-m</tt> <var>pattern</var> ... ]</dt>
<dt> <tt>functions +M</tt> [ <tt>-m</tt> ] <var>mathfn</var></dt>
<dd><p>Equivalent to <tt>typeset -f</tt>, with the exception of the <tt>-M</tt> option.
Use of the <tt>-M</tt> option may not be combined with any of the options
handled by <tt>typeset -f</tt>.
</p>
<p><tt>functions -M</tt> <var>mathfn</var> defines <var>mathfn</var> as the name of
a mathematical function recognised in all forms of arithmetical expressions;
see
<a href="Arithmetic-Evaluation.html#Arithmetic-Evaluation">Arithmetic Evaluation</a>. By default <var>mathfn</var> may take
any number of comma-separated arguments. If <var>min</var> is given,
it must have exactly <var>min</var> args; if <var>min</var> and <var>max</var> are
both given, it must have at least <var>min</var> and at most <var>max</var>
args. <var>max</var> may be -1 to indicate that there is no upper limit.
</p>
<p>By default the function is implemented by a shell function of the same
name; if <var>shellfn</var> is specified it gives the name of the corresponding
shell function while <var>mathfn</var> remains the name used in arithmetical
expressions. The name of the function in <tt>$0</tt> is <var>mathfn</var> (not
<var>shellfn</var> as would usually be the case), provided the option
<tt>FUNCTION_ARGZERO</tt> is in effect. The positional parameters in the shell
function correspond to the arguments of the mathematical function call.
The result of the last arithmetical expression evaluated
inside the shell function (even if it is a form that normally only returns
a status) gives the result of the mathematical function.
</p>
<p><tt>functions -M</tt> with no arguments lists all such user-defined functions in
the same form as a definition. With the additional option <tt>-m</tt> and
a list of arguments, all functions whose <var>mathfn</var> matches one of
the pattern arguments are listed.
</p>
<p><tt>function +M</tt> removes the list of mathematical functions; with the
additional option <tt>-m</tt> the arguments are treated as patterns and
all functions whose <tt>mathfn</tt> matches the pattern are removed. Note
that the shell function implementing the behaviour is not removed
(regardless of whether its name coincides with <tt>mathfn</tt>).
</p>
<p>For example, the following prints the cube of 3:
</p>
<table><tr><td> </td><td><pre class="example">zmath_cube() { (( $1 * $1 * $1 )) }
functions -M cube 1 1 zmath_cube
print $(( cube(3) ))
</pre></td></tr></table>
</dd>
<dt> <tt>getcap</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fcap-Module">The zsh/cap Module</a>.
</p>
<a name="index-getln"></a>
<a name="index-line_002c-reading"></a>
<a name="index-reading-a-line"></a>
</dd>
<dt> <tt>getln</tt> [ <tt>-AclneE</tt> ] <var>name</var> ...</dt>
<dd><p>Read the top value from the buffer stack and put it in
the shell parameter <tt>name</tt>. Equivalent to
<tt>read -zr</tt>.
</p>
<a name="index-getopts"></a>
<a name="index-options_002c-processing"></a>
</dd>
<dt> <tt>getopts</tt> <var>optstring</var> <var>name</var> [ <var>arg</var> ... ]</dt>
<dd><p>Checks the <var>arg</var>s for legal options. If the <var>arg</var>s are omitted,
use the positional parameters. A valid option argument
begins with a ‘<tt>+</tt>’ or a ‘<tt>-</tt>’. An argument not beginning with
a ‘<tt>+</tt>’ or a ‘<tt>-</tt>’, or the argument ‘<tt>-</tt><tt>-</tt>’, ends the options.
Note that a single ‘<tt>-</tt>’ is not considered a valid option argument.
<var>optstring</var> contains the letters that <tt>getopts</tt>
recognizes. If a letter is followed by a ‘<tt>:</tt>’, that option
requires an argument. The options can be
separated from the argument by blanks.
</p>
<p>Each time it is invoked, <tt>getopts</tt> places the option letter it finds
in the shell parameter <var>name</var>, prepended with a ‘<tt>+</tt>’ when
<var>arg</var> begins with a ‘<tt>+</tt>’. The index of the next <var>arg</var>
is stored in <tt>OPTIND</tt>. The option argument, if any,
is stored in <tt>OPTARG</tt>.
<a name="index-OPTIND_002c-use-of"></a>
<a name="index-OPTARG_002c-use-of"></a>
</p>
<p>The first option to be examined may be changed by explicitly assigning
to <tt>OPTIND</tt>. <tt>OPTIND</tt> has an initial value of <tt>1</tt>, and is
normally reset to <tt>1</tt> upon exit from a shell function. <tt>OPTARG</tt>
is not reset and retains its value from the most recent call to
<tt>getopts</tt>. If either of <tt>OPTIND</tt> or <tt>OPTARG</tt> is explicitly
unset, it remains unset, and the index or option argument is not
stored. The option itself is still stored in <var>name</var> in this case.
</p>
<p>A leading ‘<tt>:</tt>’ in <var>optstring</var> causes <tt>getopts</tt> to store the
letter of any invalid option in <tt>OPTARG</tt>, and to set <var>name</var> to
‘<tt>?</tt>’ for an unknown option and to ‘<tt>:</tt>’ when a required argument is
missing. Otherwise, <tt>getopts</tt> sets <var>name</var> to ‘<tt>?</tt>’ and prints
an error message when an option is invalid. The exit status is
nonzero when there are no more options.
</p>
<a name="index-hash"></a>
</dd>
<dt> <tt>hash</tt> [ <tt>-Ldfmrv</tt> ] [ <var>name</var>[<tt>=</tt><var>value</var>] ] ...</dt>
<dd><p><tt>hash</tt> can be used to directly modify the contents of the command
hash table, and the named directory hash table. Normally one would
modify these tables by modifying one’s <tt>PATH</tt>
(for the command hash table) or by creating appropriate shell parameters
(for the named directory hash table).
The choice of hash table to work on is determined by the <tt>-d</tt> option;
without the option the command hash table is used, and with the option the
named directory hash table is used.
</p>
<p>Given no arguments, and neither the <tt>-r</tt> or <tt>-f</tt> options,
the selected hash table will be listed in full.
</p>
<p>The <tt>-r</tt> option causes the selected hash table to be emptied.
It will be subsequently rebuilt in the normal fashion.
The <tt>-f</tt> option causes the selected hash table to be fully
rebuilt immediately. For the command hash table this hashes
all the absolute directories in the <tt>PATH</tt>,
and for the named directory hash table this adds all users’ home directories.
These two options cannot be used with any arguments.
</p>
<p>The <tt>-m</tt> option causes the arguments to be taken as patterns
(which should be quoted) and the elements of the hash table
matching those patterns are printed. This is the only way to display
a limited selection of hash table elements.
</p>
<p>For each <var>name</var> with a corresponding <var>value</var>, put ‘<var>name</var>’ in
the selected hash table, associating it with the pathname ‘<var>value</var>’.
In the command hash table, this means that
whenever ‘<var>name</var>’ is used as a command argument, the shell will try
to execute the file given by ‘<var>value</var>’.
In the named directory hash table, this means
that ‘<var>value</var>’ may be referred to as ‘<tt>~</tt><var>name</var>’.
</p>
<p>For each <var>name</var> with no
corresponding <var>value</var>, attempt to add <var>name</var> to the hash table,
checking what the appropriate <tt>value</tt> is in the normal manner for
that hash table. If an appropriate <tt>value</tt> can’t be found, then
the hash table will be unchanged.
</p>
<p>The <tt>-v</tt> option causes hash table entries to be listed as they are
added by explicit specification. If has no effect if used with <tt>-f</tt>.
</p>
<p>If the <tt>-L</tt> flag is present, then each hash table entry is printed in
the form of a call to hash.
</p>
<a name="index-history-1"></a>
</dd>
<dt> <tt>history</tt></dt>
<dd><p>Same as <tt>fc -l</tt>.
</p>
<a name="index-integer"></a>
</dd>
<dt> <tt>integer</tt> [ {<tt>+</tt>|<tt>-</tt>}<tt>Hghilprtux</tt> ] [ <tt>-LRZ</tt> [ <var>n</var> ]] [ <var>name</var>[<tt>=</tt><var>value</var>] ... ]</dt>
<dd><p>Equivalent to <tt>typeset -i</tt>, except that options irrelevant to
integers are not permitted.
</p>
<a name="index-jobs-1"></a>
</dd>
<dt> <tt>jobs</tt> [ <tt>-dlprs</tt> ] [ <var>job</var> ... ]</dt>
<dt> <tt>jobs -Z</tt> <var>string</var></dt>
<dd><p>Lists information about each given job, or all jobs
if <var>job</var> is omitted. The <tt>-l</tt> flag lists process
IDs, and the <tt>-p</tt> flag lists process groups.
If the <tt>-r</tt> flag is specified only running jobs will be listed
and if the <tt>-s</tt> flag is given only stopped jobs are shown.
If the <tt>-d</tt> flag is given, the directory from which the job was
started (which may not be the current directory of the job) will also
be shown.
</p>
<p>The <tt>-Z</tt> option replaces the shell’s argument and environment space with
the given string, truncated if necessary to fit. This will normally be
visible in <tt>ps</tt> (man page ps(1)) listings. This feature is typically
used by daemons, to indicate their state.
</p>
<a name="index-kill"></a>
<a name="index-killing-jobs"></a>
<a name="index-jobs_002c-killing"></a>
</dd>
<dt> <tt>kill</tt> [ <tt>-s</tt> <var>signal_name</var> | <tt>-n</tt> <var>signal_number</var> | <tt>-</tt><var>sig</var> ] <var>job</var> ...</dt>
<dt> <tt>kill</tt> <tt>-l</tt> [ <var>sig</var> ... ]</dt>
<dd><p>Sends either <tt>SIGTERM</tt> or the specified signal to the given
jobs or processes.
Signals are given by number or by names, with or without the ‘<tt>SIG</tt>’
prefix.
If the signal being sent is not ‘<tt>KILL</tt>’ or ‘<tt>CONT</tt>’, then the job
will be sent a ‘<tt>CONT</tt>’ signal if it is stopped.
The argument <var>job</var> can be the process ID of a job
not in the job list.
In the second form, <tt>kill -l</tt>, if <var>sig</var> is not
specified the signal names are listed. Otherwise, for each
<var>sig</var> that is a name, the corresponding signal number is
listed. For each <var>sig</var> that is a signal number or a number
representing the exit status of a process which was terminated or
stopped by a signal the name of the signal is printed.
</p>
<p>On some systems, alternative signal names are allowed for a few signals.
Typical examples are <tt>SIGCHLD</tt> and <tt>SIGCLD</tt> or <tt>SIGPOLL</tt> and
<tt>SIGIO</tt>, assuming they correspond to the same signal number. <tt>kill
-l</tt> will only list the preferred form, however <tt>kill -l</tt> <var>alt</var> will
show if the alternative form corresponds to a signal number. For example,
under Linux <tt>kill -l IO</tt> and <tt>kill -l POLL</tt> both output 29, hence
<tt>kill -IO</tt> and <tt>kill -POLL</tt> have the same effect.
</p>
<p>Many systems will allow process IDs to be negative to kill a process
group or zero to kill the current process group.
</p>
<a name="index-let"></a>
</dd>
<dt> <tt>let</tt> <var>arg</var> ...</dt>
<dd><p>Evaluate each <var>arg</var> as an arithmetic expression.
See
<a href="Arithmetic-Evaluation.html#Arithmetic-Evaluation">Arithmetic Evaluation</a>
for a description of arithmetic expressions. The exit status is 0 if the
value of the last expression is nonzero, 1 if it is zero, and 2 if
an error occurred.
</p>
<a name="index-limit"></a>
<a name="index-resource-limits"></a>
<a name="index-limits_002c-resource"></a>
</dd>
<dt> <tt>limit</tt> [ <tt>-hs</tt> ] [ <var>resource</var> [ <var>limit</var> ] ] ...</dt>
<dd><p>Set or display resource limits. Unless the <tt>-s</tt> flag is given,
the limit applies only the children of the shell. If <tt>-s</tt> is
given without other arguments, the resource limits of the current
shell is set to the previously set resource limits of the children.
</p>
<p>If <var>limit</var> is not specified, print the current limit placed
on <var>resource</var>, otherwise
set the limit to the specified value. If the <tt>-h</tt> flag
is given, use hard limits instead of soft limits.
If no <var>resource</var> is given, print all limits.
</p>
<p>When looping over multiple resources, the shell will abort immediately if
it detects a badly formed argument. However, if it fails to set a limit
for some other reason it will continue trying to set the remaining limits.
</p>
<p><var>resource</var> can be one of:
</p>
<dl compact="compact">
<dt> <tt>addressspace</tt></dt>
<dd><p>Maximum amount of address space used.
</p></dd>
<dt> <tt>aiomemorylocked</tt></dt>
<dd><p>Maximum amount of memory locked in RAM for AIO operations.
</p></dd>
<dt> <tt>aiooperations</tt></dt>
<dd><p>Maximum number of AIO operations.
</p></dd>
<dt> <tt>cachedthreads</tt></dt>
<dd><p>Maximum number of cached threads.
</p></dd>
<dt> <tt>coredumpsize</tt></dt>
<dd><p>Maximum size of a core dump.
</p></dd>
<dt> <tt>cputime</tt></dt>
<dd><p>Maximum CPU seconds per process.
</p></dd>
<dt> <tt>datasize</tt></dt>
<dd><p>Maximum data size (including stack) for each process.
</p></dd>
<dt> <tt>descriptors</tt></dt>
<dd><p>Maximum value for a file descriptor.
</p></dd>
<dt> <tt>filesize</tt></dt>
<dd><p>Largest single file allowed.
</p></dd>
<dt> <tt>maxproc</tt></dt>
<dd><p>Maximum number of processes.
</p></dd>
<dt> <tt>maxpthreads</tt></dt>
<dd><p>Maximum number of threads per process.
</p></dd>
<dt> <tt>memorylocked</tt></dt>
<dd><p>Maximum amount of memory locked in RAM.
</p></dd>
<dt> <tt>memoryuse</tt></dt>
<dd><p>Maximum resident set size.
</p></dd>
<dt> <tt>msgqueue</tt></dt>
<dd><p>Maximum number of bytes in POSIX message queues.
</p></dd>
<dt> <tt>resident</tt></dt>
<dd><p>Maximum resident set size.
</p></dd>
<dt> <tt>sigpending</tt></dt>
<dd><p>Maximum number of pending signals.
</p></dd>
<dt> <tt>sockbufsize</tt></dt>
<dd><p>Maximum size of all socket buffers.
</p></dd>
<dt> <tt>stacksize</tt></dt>
<dd><p>Maximum stack size for each process.
</p></dd>
<dt> <tt>vmemorysize</tt></dt>
<dd><p>Maximum amount of virtual memory.
</p></dd>
</dl>
<p>Which of these resource limits are available depends on the system.
<var>resource</var> can be abbreviated to any unambiguous prefix. It
can also be an integer, which corresponds to the integer defined
for the resource by the operating system.
</p>
<p>If argument corresponds to a number which is out of the range of the
resources configured into the shell, the shell will try to read or write
the limit anyway, and will report an error if this fails. As the shell
does not store such resources internally, an attempt to set the limit will
fail unless the <tt>-s</tt> option is present.
</p>
<p><var>limit</var> is a number, with an optional scaling factor, as follows:
</p>
<dl compact="compact">
<dt> <var>n</var><tt>h</tt></dt>
<dd><p>hours
</p></dd>
<dt> <var>n</var><tt>k</tt></dt>
<dd><p>kilobytes (default)
</p></dd>
<dt> <var>n</var><tt>m</tt></dt>
<dd><p>megabytes or minutes
</p></dd>
<dt> [<var>mm</var><tt>:</tt>]<var>ss</var></dt>
<dd><p>minutes and seconds
</p></dd>
</dl>
<p>The <tt>limit</tt> command is not made available by default when the
shell starts in a mode emulating another shell. It can be made available
with the command ‘<tt>zmodload -F zsh/rlimits b:limit</tt>’.
</p>
<a name="index-local"></a>
</dd>
<dt> <tt>local</tt> [ {<tt>+</tt>|<tt>-</tt>}<tt>AEFHUahlprtux</tt> ] [ <tt>-LRZi</tt> [ <var>n</var> ]] [ <var>name</var>[<tt>=</tt><var>value</var>] ] ...</dt>
<dd><p>Same as <tt>typeset</tt>, except that the options <tt>-g</tt>, and
<tt>-f</tt> are not permitted. In this case the <tt>-x</tt> option does not force
the use of <tt>-g</tt>, i.e. exported variables will be local to functions.
</p>
<a name="index-log"></a>
<a name="index-watch_002c-use-of"></a>
<a name="index-watching-users"></a>
<a name="index-users_002c-watching"></a>
</dd>
<dt> <tt>log</tt></dt>
<dd><p>List all users currently logged in who are affected by
the current setting of the <tt>watch</tt> parameter.
</p>
<a name="index-logout"></a>
</dd>
<dt> <tt>logout</tt> [ <var>n</var> ]</dt>
<dd><p>Same as <tt>exit</tt>, except that it only works in a login shell.
</p>
</dd>
<dt> <tt>noglob</tt> <var>simple command</var></dt>
<dd><p>See <a href="Shell-Grammar.html#Precommand-Modifiers">Precommand Modifiers</a>.
</p>
<a name="index-popd"></a>
</dd>
<dt> <tt>popd</tt> [ [-q] {<tt>+</tt>|<tt>-</tt>}<var>n</var> ]</dt>
<dd><p>Remove an entry from the directory stack, and perform a <tt>cd</tt> to
the new top directory. With no argument, the current top entry is
removed. An argument of the form ‘<tt>+</tt><var>n</var>’ identifies a stack
entry by counting from the left of the list shown by the <tt>dirs</tt> command,
starting with zero. An argument of the form <tt>-n</tt> counts from the right.
<a name="index-PUSHD_005fMINUS_002c-use-of-1"></a>
If the <tt>PUSHD_MINUS</tt> option is set, the meanings of ‘<tt>+</tt>’ and
‘<tt>-</tt>’ in this context are swapped.
</p>
<p>If the <tt>-q</tt> (quiet) option is specified, the hook function <tt>chpwd</tt>
and the functions in the array <tt>$chpwd_functions</tt> are not called,
and the new directory stack is not printed. This is useful for calls to
<tt>popd</tt> that do not change the environment seen by an interactive user.
</p>
<a name="index-print"></a>
</dd>
<dt> <tt>print</tt> [ <tt>-abcDilmnNoOpPrsSz</tt> ] [ <tt>-u</tt> <var>n</var> ] [ <tt>-f</tt> <var>format</var> ] [ <tt>-C</tt> <var>cols</var> ]</dt>
<dt> [ <tt>-R</tt> [ <tt>-en</tt> ]] [ <var>arg</var> ... ]</dt>
<dd><p>With the ‘<tt>-f</tt>’ option the arguments are printed as described by <tt>printf</tt>.
With no flags or with the flag ‘<tt>-</tt>’, the arguments are printed on
the standard output as described by <tt>echo</tt>, with the following differences:
the escape sequence ‘<tt>\M-</tt><var>x</var>’ metafies the character
<var>x</var> (sets the highest bit),
‘<tt>\C-</tt><var>x</var>’ produces a control character (‘<tt>\C-@</tt>’ and ‘<tt>\C-?</tt>’ give the
characters NUL and delete), and ‘<tt>\E</tt>’ is a synonym for ‘<tt>\e</tt>’.
Finally, if not in an escape
sequence, ‘<tt>\</tt>’ escapes the following character and is not printed.
</p>
<dl compact="compact">
<dt> <tt>-a</tt></dt>
<dd><p>Print arguments with the column incrementing first. Only useful with the
<tt>-c</tt> and <tt>-C</tt> options.
</p>
</dd>
<dt> <tt>-b</tt></dt>
<dd><p>Recognize all the escape sequences defined for the <tt>bindkey</tt> command,
see
<a href="Zsh-Line-Editor.html#Zle-Builtins">Zle Builtins</a>.
</p>
</dd>
<dt> <tt>-c</tt></dt>
<dd><p>Print the arguments in columns. Unless <tt>-a</tt> is also given, arguments are
printed with the row incrementing first.
</p>
</dd>
<dt> <tt>-C</tt> <var>cols</var></dt>
<dd><p>Print the arguments in <var>cols</var> columns. Unless <tt>-a</tt> is also given,
arguments are printed with the row incrementing first.
</p>
</dd>
<dt> <tt>-D</tt></dt>
<dd><p>Treat the arguments as directory names, replacing prefixes with <tt>~</tt>
expressions, as appropriate.
</p>
</dd>
<dt> <tt>-i</tt></dt>
<dd><p>If given together with <tt>-o</tt> or <tt>-O</tt>, sorting is performed
case-independently.
</p>
</dd>
<dt> <tt>-l</tt></dt>
<dd><p>Print the arguments separated by newlines instead of spaces.
</p>
</dd>
<dt> <tt>-m</tt></dt>
<dd><p>Take the first argument as a pattern (should be quoted), and remove
it from the argument list together with subsequent arguments that
do not match this pattern.
</p>
</dd>
<dt> <tt>-n</tt></dt>
<dd><p>Do not add a newline to the output.
</p>
</dd>
<dt> <tt>-N</tt></dt>
<dd><p>Print the arguments separated and terminated by nulls.
</p>
</dd>
<dt> <tt>-o</tt></dt>
<dd><p>Print the arguments sorted in ascending order.
</p>
</dd>
<dt> <tt>-O</tt></dt>
<dd><p>Print the arguments sorted in descending order.
</p>
</dd>
<dt> <tt>-p</tt></dt>
<dd><p>Print the arguments to the input of the coprocess.
</p>
</dd>
<dt> <tt>-P</tt></dt>
<dd><p>Perform prompt expansion (see
<a href="Prompt-Expansion.html#Prompt-Expansion">Prompt Expansion</a>).
</p>
</dd>
<dt> <tt>-r</tt></dt>
<dd><p>Ignore the escape conventions of <tt>echo</tt>.
</p>
</dd>
<dt> <tt>-R</tt></dt>
<dd><p>Emulate the BSD <tt>echo</tt> command, which does not process escape sequences
unless the <tt>-e</tt> flag is given. The <tt>-n</tt> flag suppresses the trailing
newline. Only the <tt>-e</tt> and <tt>-n</tt> flags are recognized after
<tt>-R</tt>; all other arguments and options are printed.
</p>
</dd>
<dt> <tt>-s</tt></dt>
<dd><p>Place the results in the history list instead of on the standard output.
Each argument to the <tt>print</tt> command is treated as a single word in the
history, regardless of its content.
</p>
</dd>
<dt> <tt>-S</tt></dt>
<dd><p>Place the results in the history list instead of on the standard output.
In this case only a single argument is allowed; it will be split into
words as if it were a full shell command line. The effect is
similar to reading the line from a history file with the
<tt>HIST_LEX_WORDS</tt> option active.
</p>
</dd>
<dt> <tt>-u</tt> <var>n</var></dt>
<dd><p>Print the arguments to file descriptor <var>n</var>.
</p>
</dd>
<dt> <tt>-z</tt></dt>
<dd><p>Push the arguments onto the editing buffer stack, separated by spaces.
</p>
</dd>
</dl>
<p>If any of ‘<tt>-m</tt>’, ‘<tt>-o</tt>’ or ‘<tt>-O</tt>’ are used in combination with
‘<tt>-f</tt>’ and there are no arguments (after the removal process in the
case of ‘<tt>-m</tt>’) then nothing is printed.
</p>
<a name="index-printf"></a>
</dd>
<dt> <tt>printf</tt> <var>format</var> [ <var>arg</var> ... ]</dt>
<dd><p>Print the arguments according to the format specification. Formatting
rules are the same as used in C. The same escape sequences as for <tt>echo</tt>
are recognised in the format. All C conversion specifications ending in
one of csdiouxXeEfgGn are handled. In addition to this, ‘<tt>%b</tt>’ can be
used instead of ‘<tt>%s</tt>’ to cause escape sequences in the argument to be
recognised and ‘<tt>%q</tt>’ can be used to quote the argument in such a way
that allows it to be reused as shell input. With the numeric format
specifiers, if the corresponding argument starts with a quote character,
the numeric value of the following character is used as the number to
print otherwise the argument is evaluated as an arithmetic expression. See
<a href="Arithmetic-Evaluation.html#Arithmetic-Evaluation">Arithmetic Evaluation</a>
for a description of arithmetic
expressions. With ‘<tt>%n</tt>’, the corresponding argument is taken as an
identifier which is created as an integer parameter.
</p>
<p>Normally, conversion specifications are applied to each argument in order
but they can explicitly specify the <var>n</var>th argument is to be used by
replacing ‘<tt>%</tt>’ by ‘<tt>%</tt><var>n</var><tt>$</tt>’ and ‘<tt>*</tt>’ by ‘<tt>*</tt><var>n</var><tt>$</tt>’.
It is recommended that you do not mix references of this explicit style
with the normal style and the handling of such mixed styles may be subject
to future change.
</p>
<p>If arguments remain unused after formatting, the format string is reused
until all arguments have been consumed. With the <tt>print</tt> builtin, this
can be suppressed by using the <tt>-r</tt> option. If more arguments are
required by the format than have been specified, the behaviour is as if
zero or an empty string had been specified as the argument.
</p>
<a name="index-pushd"></a>
<a name="index-PUSHD_005fTO_005fHOME_002c-use-of"></a>
<a name="index-PUSHD_005fMINUS_002c-use-of-2"></a>
<a name="index-CDABLE_005fVARS_002c-use-of"></a>
<a name="index-PUSHD_005fSILENT_002c-use-of"></a>
</dd>
<dt> <tt>pushd</tt> [ <tt>-qsLP</tt> ] [ <var>arg</var> ]</dt>
<dt> <tt>pushd</tt> [ <tt>-qsLP</tt> ] <var>old</var> <var>new</var></dt>
<dt> <tt>pushd</tt> [ <tt>-qsLP</tt> ] {<tt>+</tt>|<tt>-</tt>}<var>n</var></dt>
<dd><p>Change the current directory, and push the old current directory
onto the directory stack. In the first form, change the
current directory to <var>arg</var>.
If <var>arg</var> is not specified, change to the second directory
on the stack (that is, exchange the top two entries), or
change to <tt>$HOME</tt> if the <tt>PUSHD_TO_HOME</tt>
option is set or if there is only one entry on the stack.
Otherwise, <var>arg</var> is interpreted as it would be by <tt>cd</tt>.
The meaning of <var>old</var> and <var>new</var> in the second form is also
the same as for <tt>cd</tt>.
</p>
<p>The third form of <tt>pushd</tt> changes directory by rotating the
directory list. An argument of the form ‘<tt>+</tt><var>n</var>’ identifies a stack
entry by counting from the left of the list shown by the <tt>dirs</tt>
command, starting with zero. An argument of the form ‘<tt>-</tt><var>n</var>’ counts
from the right. If the <tt>PUSHD_MINUS</tt> option is set, the meanings
of ‘<tt>+</tt>’ and ‘<tt>-</tt>’ in this context are swapped.
</p>
<p>If the <tt>-q</tt> (quiet) option is specified, the hook function <tt>chpwd</tt>
and the functions in the array <tt>$chpwd_functions</tt> are not called,
and the new directory stack is not printed. This is useful for calls to
<tt>pushd</tt> that do not change the environment seen by an interactive user.
</p>
<p>If the option <tt>-q</tt> is not specified and the shell option <tt>PUSHD_SILENT</tt>
is not set, the directory stack will be printed after a <tt>pushd</tt> is
performed.
</p>
<p>The options <tt>-s</tt>, <tt>-L</tt> and <tt>-P</tt> have the same meanings as for the
<tt>cd</tt> builtin.
</p>
<a name="index-pushln"></a>
</dd>
<dt> <tt>pushln</tt> [ <var>arg</var> ... ]</dt>
<dd><p>Equivalent to <tt>print -nz</tt>.
</p>
<a name="index-pwd"></a>
<a name="index-CHASE_005fLINKS_002c-use-of"></a>
</dd>
<dt> <tt>pwd</tt> [ <tt>-rLP</tt> ]</dt>
<dd><p>Print the absolute pathname of the current working directory.
If the <tt>-r</tt> or the <tt>-P</tt> flag is specified, or the <tt>CHASE_LINKS</tt>
option is set and the <tt>-L</tt> flag is not given, the printed path will not
contain symbolic links.
</p>
<a name="index-r"></a>
</dd>
<dt> <tt>r</tt></dt>
<dd><p>Same as <tt>fc -e -</tt>.
</p>
<a name="index-read"></a>
<a name="index-IFS_002c-use-of-2"></a>
</dd>
<dt> <tt>read</tt> [ <tt>-rszpqAclneE</tt> ] [ <tt>-t</tt> [ <var>num</var> ] ] [ <tt>-k</tt> [ <var>num</var> ] ] [ <tt>-d</tt> <var>delim</var> ] [ <tt>-u</tt> <var>n</var> ] [ <var>name</var>[<tt>?</tt><var>prompt</var>] ] [ <var>name</var> ... ]</dt>
<dd><a name="index-REPLY_002c-use-of-2"></a>
<a name="index-reply_002c-use-of-1"></a>
<p>Read one line and break it into fields using the characters
in <tt>$IFS</tt> as separators, except as noted below.
The first field is assigned to the first <var>name</var>, the second field
to the second <var>name</var>, etc., with leftover
fields assigned to the last <var>name</var>.
If <var>name</var> is omitted then
<tt>REPLY</tt> is used for scalars and <tt>reply</tt> for arrays.
</p>
<dl compact="compact">
<dt> <tt>-r</tt></dt>
<dd><p>Raw mode: a ‘<tt>\</tt>’ at the end of a line does not signify line
continuation and backslashes in the line don’t quote the following
character and are not removed.
</p>
</dd>
<dt> <tt>-s</tt></dt>
<dd><p>Don’t echo back characters if reading from the terminal. Currently does
not work with the <tt>-q</tt> option.
</p>
</dd>
<dt> <tt>-q</tt></dt>
<dd><p>Read only one character from the terminal and set <var>name</var> to
‘<tt>y</tt>’ if this character was ‘<tt>y</tt>’ or ‘<tt>Y</tt>’ and to ‘<tt>n</tt>’ otherwise.
With this flag set the return status is zero only if the character was
‘<tt>y</tt>’ or ‘<tt>Y</tt>’. This option may be used with a timeout; if
the read times out, or encounters end of file, status 2 is returned.
Input is read from the terminal unless one of <tt>-u</tt>
or <tt>-p</tt> is present. This option may also be used within zle widgets.
</p>
</dd>
<dt> <tt>-k</tt> [ <var>num</var> ]</dt>
<dd><p>Read only one (or <var>num</var>) characters. All are assigned to the first
<var>name</var>, without word splitting. This flag is ignored when <tt>-q</tt> is
present. Input is read from the terminal unless one of <tt>-u</tt> or <tt>-p</tt>
is present. This option may also be used within zle widgets.
</p>
<p>Note that despite the mnemonic ‘key’ this option does read full
characters, which may consist of multiple bytes if the option
<tt>MULTIBYTE</tt> is set.
</p>
</dd>
<dt> <tt>-z</tt></dt>
<dd><p>Read one entry from the editor buffer stack and assign it to the first
<var>name</var>, without word splitting. Text is pushed onto the stack with
‘<tt>print -z</tt>’ or with <tt>push-line</tt> from the line editor (see
<a href="Zsh-Line-Editor.html#Zsh-Line-Editor">Zsh Line Editor</a>). This flag is ignored when the <tt>-k</tt> or <tt>-q</tt> flags are present.
</p>
</dd>
<dt> <tt>-e</tt></dt>
<dt> <tt>-E</tt></dt>
<dd><p>The input read is printed (echoed) to the standard output. If the <tt>-e</tt>
flag is used, no input is assigned to the parameters.
</p>
</dd>
<dt> <tt>-A</tt></dt>
<dd><p>The first <var>name</var> is taken as the name of an array and all words are
assigned to it.
</p>
</dd>
<dt> <tt>-c</tt></dt>
<dt> <tt>-l</tt></dt>
<dd><p>These flags are allowed only if called inside a
function used for completion (specified with the <tt>-K</tt> flag to
<tt>compctl</tt>). If the <tt>-c</tt> flag is given, the words of the
current command are read. If the <tt>-l</tt> flag is given, the whole
line is assigned as a scalar. If both flags are present, <tt>-l</tt>
is used and <tt>-c</tt> is ignored.
</p>
</dd>
<dt> <tt>-n</tt></dt>
<dd><p>Together with <tt>-c</tt>, the number of the word the cursor is on is
read. With <tt>-l</tt>, the index of the character the cursor is on is
read. Note that the command name is word number 1, not word 0,
and that when the cursor is at the end of the line, its character
index is the length of the line plus one.
</p>
</dd>
<dt> <tt>-u</tt> <var>n</var></dt>
<dd><p>Input is read from file descriptor <var>n</var>.
</p>
</dd>
<dt> <tt>-p</tt></dt>
<dd><p>Input is read from the coprocess.
</p>
</dd>
<dt> <tt>-d</tt> <var>delim</var></dt>
<dd><p>Input is terminated by the first character of <var>delim</var> instead of
by newline.
</p>
</dd>
<dt> <tt>-t</tt> [ <var>num</var> ]</dt>
<dd><p>Test if input is available before attempting to read. If <var>num</var>
is present, it must begin with a digit and will be evaluated
to give a number of seconds, which may be a floating point number;
in this case the read times out if input is not available within this
time. If <var>num</var> is not present, it is taken to be zero, so that
<tt>read</tt> returns immediately if no input is available.
If no input is available, return status 1 and do not set any variables.
</p>
<p>This option is not available when reading from the editor buffer with
<tt>-z</tt>, when called from within completion with <tt>-c</tt> or <tt>-l</tt>, with
<tt>-q</tt> which clears the input queue before reading, or within zle where
other mechanisms should be used to test for input.
</p>
<p>Note that read does not attempt to alter the input processing mode. The
default mode is canonical input, in which an entire line is read at a time,
so usually ‘<tt>read -t</tt>’ will not read anything until an entire line has
been typed. However, when reading from the terminal with <tt>-k</tt>
input is processed one key at a time; in this case, only availability of
the first character is tested, so that e.g. ‘<tt>read -t -k 2</tt>’ can still
block on the second character. Use two instances of ‘<tt>read -t -k</tt>’ if
this is not what is wanted.
</p>
</dd>
</dl>
<p>If the first argument contains a ‘<tt>?</tt>’, the remainder of this
word is used as a <var>prompt</var> on standard error when the shell
is interactive.
</p>
<p>The value (exit status) of <tt>read</tt> is 1 when an end-of-file is
encountered, or when <tt>-c</tt> or <tt>-l</tt> is present and the command is
not called from a <tt>compctl</tt> function, or as described for <tt>-q</tt>.
Otherwise the value is 0.
</p>
<p>The behavior of some combinations of the <tt>-k</tt>, <tt>-p</tt>, <tt>-q</tt>, <tt>-u</tt>
and <tt>-z</tt> flags is undefined. Presently <tt>-q</tt> cancels all the others,
<tt>-p</tt> cancels <tt>-u</tt>, <tt>-k</tt> cancels <tt>-z</tt>, and otherwise <tt>-z</tt>
cancels both <tt>-p</tt> and <tt>-u</tt>.
</p>
<p>The <tt>-c</tt> or <tt>-l</tt> flags cancel any and all of <tt>-kpquz</tt>.
</p>
<a name="index-parameters_002c-marking-readonly"></a>
<a name="index-readonly"></a>
</dd>
<dt> <tt>readonly</tt></dt>
<dd><p>Same as <tt>typeset -r</tt>.
</p>
<a name="index-rehash"></a>
</dd>
<dt> <tt>rehash</tt></dt>
<dd><p>Same as <tt>hash -r</tt>.
</p>
<a name="index-return"></a>
<a name="index-functions_002c-returning-from"></a>
</dd>
<dt> <tt>return</tt> [ <var>n</var> ]</dt>
<dd><p>Causes a shell function or ‘<tt>.</tt>’ script to return to
the invoking script with the return status specified by <var>n</var>. If <var>n</var>
is omitted, the return status is that of the last command
executed.
</p>
<p>If <tt>return</tt> was executed from a trap in a <tt>TRAP</tt><var>NAL</var> function,
the effect is different for zero and non-zero return status. With zero
status (or after an implicit return at the end of the trap), the shell
will return to whatever it was previously processing; with a non-zero
status, the shell will behave as interrupted except that the return
status of the trap is retained. Note that the numeric value of the signal
which caused the trap is passed as the first argument, so the statement
‘<tt>return $((128+$1))</tt>’ will return the same status as if the signal
had not been trapped.
</p>
</dd>
<dt> <tt>sched</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fsched-Module">The zsh/sched Module</a>.
</p>
<a name="index-set"></a>
<a name="index-parameters_002c-listing"></a>
<a name="index-parameters_002c-positional"></a>
<a name="index-parameters_002c-setting-array"></a>
<a name="index-array-parameters_002c-setting"></a>
<a name="index-KSH_005fARRAYS_002c-use-of-1"></a>
</dd>
<dt> <tt>set</tt> [ {<tt>+</tt>|<tt>-</tt>}<var>options</var> | {<tt>+</tt>|<tt>-</tt>}<tt>o</tt> [ <var>option_name</var> ] ] ... [ {<tt>+</tt>|<tt>-</tt>}<tt>A</tt> [ <var>name</var> ] ] [ <var>arg</var> ... ]</dt>
<dd><p>Set the options for the shell and/or set the positional parameters, or
declare and set an array. If the <tt>-s</tt> option is given, it causes the
specified arguments to be sorted before assigning them to the positional
parameters (or to the array <var>name</var> if <tt>-A</tt> is used). With <tt>+s</tt>
sort arguments in descending order. For the meaning of the other flags, see
<a href="Options.html#Options">Options</a>. Flags may be specified by name using the <tt>-o</tt> option. If no option
name is supplied with <tt>-o</tt>, the current option states are printed: see
the description of <tt>setopt</tt> below for more information on the format.
With <tt>+o</tt> they are printed in a form that can be used as input
to the shell.
</p>
<p>If the <tt>-A</tt> flag is specified, <var>name</var> is set to an array containing
the given <var>arg</var>s; if no <var>name</var> is specified, all arrays are printed
together with their values.
</p>
<p>If <tt>+A</tt> is used and <var>name</var> is an array, the
given arguments will replace the initial elements of that array; if no
<var>name</var> is specified, all arrays are printed without their values.
</p>
<p>The behaviour of arguments after <tt>-A</tt> <var>name</var> or <tt>+A</tt> <var>name</var>
depends on whether the option <tt>KSH_ARRAYS</tt> is set. If it is not set, all
arguments following <var>name</var> are treated as values for the array,
regardless of their form. If the option is set, normal option processing
continues at that point; only regular arguments are treated as values for
the array. This means that
</p>
<table><tr><td> </td><td><pre class="example">set -A array -x -- foo
</pre></td></tr></table>
<p>sets <tt>array</tt> to ‘<tt>-x -</tt><tt>- foo</tt>’ if <tt>KSH_ARRAYS</tt> is not set, but sets
the array to <tt>foo</tt> and turns on the option ‘<tt>-x</tt>’ if it is set.
</p>
<p>If the <tt>-A</tt> flag is not present, but there are arguments beyond the
options, the positional parameters are set. If the option list (if any)
is terminated by ‘<tt>-</tt><tt>-</tt>’, and there are no further arguments, the
positional parameters will be unset.
</p>
<p>If no arguments and no ‘<tt>-</tt><tt>-</tt>’ are given, then the names and values of
all parameters are printed on the standard output. If the only argument is
‘<tt>+</tt>’, the names of all parameters are printed.
</p>
<p>For historical reasons, ‘<tt>set -</tt>’ is treated as ‘<tt>set +xv</tt>’
and ‘<tt>set -</tt> <var>args</var>’ as ‘<tt>set +xv –</tt> <var>args</var>’ when in
any other emulation mode than zsh’s native mode.
</p>
</dd>
<dt> <tt>setcap</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fcap-Module">The zsh/cap Module</a>.
</p>
<a name="index-setopt"></a>
<a name="index-options_002c-setting"></a>
</dd>
<dt> <tt>setopt</tt> [ {<tt>+</tt>|<tt>-</tt>}<var>options</var> | {<tt>+</tt>|<tt>-</tt>}<tt>o</tt> <var>option_name</var> ] [ <var>name</var> ... ]</dt>
<dd><p>Set the options for the shell. All options specified either
with flags or by name are set.
</p>
<p>If no arguments are supplied, the names of all options currently set are
printed. The form is chosen so as to minimize the differences from the
default options for the current emulation (the default emulation being
native <tt>zsh</tt>, shown as <tt><Z></tt> in
<a href="Options.html#Description-of-Options">Description of Options</a>).
Options that are on by default for the emulation are
shown with the prefix <tt>no</tt> only if they are off, while other options are
shown without the prefix <tt>no</tt> and only if they are on. In addition to
options changed from the default state by the user, any options activated
automatically by the shell (for example, <tt>SHIN_STDIN</tt> or <tt>INTERACTIVE</tt>)
will be shown in the list. The format is further modified by the option
<tt>KSH_OPTION_PRINT</tt>, however the rationale for choosing options with
or without the <tt>no</tt> prefix remains the same in this case.
</p>
<p>If the <tt>-m</tt> flag is given the arguments are taken as patterns
(which should be quoted to protect them from filename expansion), and all
options with names matching these patterns are set.
</p>
<p>Note that a bad option name does not cause execution of subsequent shell
code to be aborted; this is behaviour is different from that of ‘<tt>set
-o</tt>’. This is because <tt>set</tt> is regarded as a special builtin by the
POSIX standard, but <tt>setopt</tt> is not.
</p>
<a name="index-shift"></a>
<a name="index-parameters_002c-positional-1"></a>
</dd>
<dt> <tt>shift</tt> [ <var>n</var> ] [ <var>name</var> ... ]</dt>
<dd><p>The positional parameters <tt>${</tt><var>n</var>+1<tt>}</tt> ... are renamed
to <tt>$1</tt> ..., where <var>n</var> is an arithmetic expression that
defaults to 1.
If any <var>name</var>s are given then the arrays with these names are
shifted instead of the positional parameters.
</p>
<a name="index-source"></a>
</dd>
<dt> <tt>source</tt> <var>file</var> [ <var>arg</var> ... ]</dt>
<dd><p>Same as ‘<tt>.</tt>’, except that the current directory is always searched and
is always searched first, before directories in <tt>$path</tt>.
</p>
</dd>
<dt> <tt>stat</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fstat-Module">The zsh/stat Module</a>.
</p>
<a name="index-suspend"></a>
<a name="index-shell_002c-suspending"></a>
<a name="index-suspending-the-shell"></a>
</dd>
<dt> <tt>suspend</tt> [ <tt>-f</tt> ]</dt>
<dd><p>Suspend the execution of the shell (send it a <tt>SIGTSTP</tt>)
until it receives a <tt>SIGCONT</tt>.
Unless the <tt>-f</tt> option is given, this will refuse to suspend a login shell.
</p>
<a name="index-test"></a>
</dd>
<dt> <tt>test</tt> [ <var>arg</var> ... ]</dt>
<dt> <tt>[</tt> [ <var>arg</var> ... ] <tt>]</tt></dt>
<dd><p>Like the system version of <tt>test</tt>. Added for compatibility;
use conditional expressions instead (see <a href="Conditional-Expressions.html#Conditional-Expressions">Conditional Expressions</a>).
The main differences between the conditional expression syntax and the
<tt>test</tt> and <tt>[</tt> builtins are: these commands are not handled
syntactically, so for example an empty variable expansion may cause an
argument to be omitted; syntax errors cause status 2 to be returned instead
of a shell error; and arithmetic operators expect integer arguments rather
than arithmetic expressions.
</p>
<p>The command attempts to implement POSIX and its extensions where these
are specified. Unfortunately there are intrinsic ambiguities in
the syntax; in particular there is no distinction between test operators
and strings that resemble them. The standard attempts to resolve these
for small numbers of arguments (up to four); for five or more arguments
compatibility cannot be relied on. Users are urged wherever possible to
use the ‘<tt>[[</tt>’ test syntax which does not have these ambiguities.
</p>
<a name="index-times"></a>
<a name="index-shell_002c-timing"></a>
<a name="index-timing-the-shell"></a>
</dd>
<dt> <tt>times</tt></dt>
<dd><p>Print the accumulated user and system times for the shell
and for processes run from the shell.
</p>
<a name="index-trap"></a>
<a name="index-signals_002c-trapping-1"></a>
<a name="index-trapping-signals-1"></a>
</dd>
<dt> <tt>trap</tt> [ <var>arg</var> ] [ <var>sig</var> ... ]</dt>
<dd><p><var>arg</var> is a series of commands (usually quoted to protect it from
immediate evaluation by the shell) to be read and executed when the shell
receives any of the signals specified by one or more <var>sig</var> args.
Each <var>sig</var> can be given as a number,
or as the name of a signal either with or without the string <tt>SIG</tt>
in front (e.g. 1, HUP, and SIGHUP are all the same signal).
</p>
<p>If <var>arg</var> is ‘<tt>-</tt>’, then the specified signals are reset to their
defaults, or, if no <var>sig</var> args are present, all traps are reset.
</p>
<p>If <var>arg</var> is an empty string, then the specified signals
are ignored by the shell (and by the commands it invokes).
</p>
<p>If <var>arg</var> is omitted but one or more <var>sig</var> args are provided (i.e.
the first argument is a valid signal number or name), the effect is the
same as if <var>arg</var> had been specified as ‘<tt>-</tt>’.
</p>
<p>The <tt>trap</tt> command with no arguments prints a list of commands
associated with each signal.
</p>
<p>If <var>sig</var> is <tt>ZERR</tt> then <var>arg</var> will be executed
after each command with a nonzero exit status. <tt>ERR</tt> is an alias
for <tt>ZERR</tt> on systems that have no <tt>SIGERR</tt> signal (this is the
usual case).
</p>
<p>If <var>sig</var> is <tt>DEBUG</tt> then <var>arg</var> will be executed
before each command if the option <tt>DEBUG_BEFORE_CMD</tt> is set
(as it is by default), else after each command. Here, a ‘command’ is
what is described as a ‘sublist’ in the shell grammar, see
<a href="Shell-Grammar.html#Simple-Commands-_0026-Pipelines">Simple Commands & Pipelines</a>.
If <tt>DEBUG_BEFORE_CMD</tt> is set various additional features are available.
First, it is possible to skip the next command by setting the option
<tt>ERR_EXIT</tt>; see the description of the <tt>ERR_EXIT</tt> option in
<a href="Options.html#Description-of-Options">Description of Options</a>. Also, the shell parameter
<tt>ZSH_DEBUG_CMD</tt> is set to the string corresponding to the command
to be executed following the trap. Note that this string is reconstructed
from the internal format and may not be formatted the same way as the
original text. The parameter is unset after the trap is executed.
</p>
<p>If <var>sig</var> is <tt>0</tt> or <tt>EXIT</tt>
and the <tt>trap</tt> statement is executed inside the body of a function,
then the command <var>arg</var> is executed after the function completes.
The value of <tt>$?</tt> at the start of execution is the exit status of the
shell or the return status of the function exiting.
If <var>sig</var> is <tt>0</tt> or <tt>EXIT</tt>
and the <tt>trap</tt> statement is not executed inside the body of a function,
then the command <var>arg</var> is executed when the shell terminates; the
trap runs before any <tt>zshexit</tt> hook functions.
</p>
<p><tt>ZERR</tt>, <tt>DEBUG</tt>, and <tt>EXIT</tt> traps are not executed inside other
traps. <tt>ZERR</tt> and <tt>DEBUG</tt> traps are kept within subshells, while
other traps are reset.
</p>
<p>Note that traps defined with the <tt>trap</tt> builtin are slightly different
from those defined as ‘<tt>TRAP</tt><var>NAL</var> () { ... }’, as the latter have
their own function environment (line numbers, local variables, etc.) while
the former use the environment of the command in which they were called.
For example,
</p>
<table><tr><td> </td><td><pre class="example">trap 'print $LINENO' DEBUG
</pre></td></tr></table>
<p>will print the line number of a command executed after it has run, while
</p>
<table><tr><td> </td><td><pre class="example">TRAPDEBUG() { print $LINENO; }
</pre></td></tr></table>
<p>will always print the number zero.
</p>
<p>Alternative signal names are allowed as described under <tt>kill</tt> above.
Defining a trap under either name causes any trap under an alternative
name to be removed. However, it is recommended that for consistency
users stick exclusively to one name or another.
</p>
<a name="index-true"></a>
<a name="index-doing-nothing_002c-successfully"></a>
</dd>
<dt> <tt>true</tt> [ <var>arg</var> ... ]</dt>
<dd><p>Do nothing and return an exit status of 0.
</p>
<a name="index-ttyctl"></a>
<a name="index-tty_002c-freezing"></a>
</dd>
<dt> <tt>ttyctl</tt> <tt>-fu</tt></dt>
<dd><p>The <tt>-f</tt> option freezes the tty, and <tt>-u</tt> unfreezes it.
When the tty is frozen, no changes made to the tty settings by
external programs will be honored by the shell, except for changes in the
size of the screen; the shell will
simply reset the settings to their previous values as soon as each
command exits or is suspended. Thus, <tt>stty</tt> and similar programs have
no effect when the tty is frozen. Without options it reports whether the
terminal is frozen or not.
</p>
<a name="index-type"></a>
</dd>
<dt> <tt>type</tt> [ <tt>-wfpams</tt> ] <var>name</var> ...</dt>
<dd><p>Equivalent to <tt>whence -v</tt>.
</p>
<a name="index-typeset"></a>
<a name="index-parameters_002c-setting"></a>
<a name="index-parameters_002c-declaring"></a>
</dd>
<dt> <tt>typeset</tt> [ {<tt>+</tt>|<tt>-</tt>}<tt>AEFHUafghklprtuxmz</tt> ] [ <tt>-LRZi</tt> [ <var>n</var> ]] [ <var>name</var>[<tt>=</tt><var>value</var>] ... ]</dt>
<dt> <tt>typeset</tt> -T [ {<tt>+|<tt>-</tt></tt>}<tt>Urux</tt> ] [ <tt>-LRZ</tt> [ <var>n</var> ]] <var>SCALAR</var>[<tt>=</tt><var>value</var>] <var>array</var> <tt>[</tt> <var>sep</var> <tt>]</tt></dt>
<dd><p>Set or display attributes and values for shell parameters.
</p>
<p>A parameter is created for each <var>name</var> that does not already refer
to one. When inside a function, a new parameter is created for every
<var>name</var> (even those that already exist), and is unset again when the
function completes. See
<a href="Parameters.html#Local-Parameters">Local Parameters</a>. The same rules apply to special shell parameters, which
retain their special attributes when made local.
</p>
<p>For each <var>name</var><tt>=</tt><var>value</var> assignment, the parameter
<var>name</var> is set to <var>value</var>. Note that arrays currently cannot be
assigned in <tt>typeset</tt> expressions, only scalars and integers. Unless
the option <tt>KSH_TYPESET</tt> is set, normal expansion rules apply to
assignment arguments, so <var>value</var> may be split into separate words; if
the option is set, assignments which can be recognised when expansion is
performed are treated as single words. For example the command
<tt>typeset vbl=$(echo one two)</tt> is treated as having one argument if
<tt>KSH_TYPESET</tt> is set, but otherwise is treated as having the two arguments
<tt>vbl=one</tt> and <tt>two</tt>.
</p>
<p>If the shell option <tt>TYPESET_SILENT</tt> is not set, for each remaining
<var>name</var> that refers to a parameter that is set, the name and value of the
parameter are printed in the form of an assignment. Nothing is printed for
newly-created parameters, or when any attribute flags listed below are
given along with the <var>name</var>. Using ‘<tt>+</tt>’ instead of minus to
introduce an attribute turns it off.
</p>
<p>If the <tt>-p</tt> option is given, parameters and values are printed in the
form of a typeset command and an assignment (which will be printed
separately for arrays and associative arrays), regardless of other flags
and options. Note that the <tt>-h</tt> flag on parameters is respected; no
value will be shown for these parameters.
</p>
<p>If the <tt>-T</tt> option is given, two or three arguments must be present (an
exception is that zero arguments are allowed to show the list of parameters
created in this fashion). The first two are the name of a scalar and an
array parameter (in that order) that will be tied together in the manner of
<tt>$PATH</tt> and <tt>$path</tt>. The optional third argument is a single-character
separator which will be used to join the elements of the array to form the
scalar; if absent, a colon is used, as with <tt>$PATH</tt>. Only the first
character of the separator is significant; any remaining characters are
ignored. Only the scalar parameter may be assigned an initial value. Both
the scalar and the array may otherwise be manipulated as normal. If one is
unset, the other will automatically be unset too. There is no way of
untying the variables without unsetting them, or converting the type of one
of them with another <tt>typeset</tt> command; <tt>+T</tt> does not work, assigning
an array to <var>SCALAR</var> is an error, and assigning a scalar to <var>array</var>
sets it to be a single-element array. Note that both ‘<tt>typeset -xT ...</tt>’
and ‘<tt>export -T ...</tt>’ work, but only the scalar will be marked for
export. Setting the value using the scalar version causes a split on all
separators (which cannot be quoted). It is possible to use the
same two tied variables with a different separator character in which
case the variables remain joined as before but the separator is changed.
This flag has a different meaning when used with <tt>-f</tt>; see below.
</p>
<p>The <tt>-g</tt> (global) flag is treated specially: it means that any
resulting parameter will not be restricted to local scope. Note that this
does not necessarily mean that the parameter will be global, as the flag
will apply to any existing parameter (even if unset) from an enclosing
function. This flag does not affect the parameter after creation, hence it
has no effect when listing existing parameters, nor does the flag <tt>+g</tt>
have any effect except in combination with <tt>-m</tt> (see below).
</p>
<p>If no <var>name</var> is present, the names and values of all parameters are
printed. In this case the attribute flags restrict the display to only
those parameters that have the specified attributes, and using ‘<tt>+</tt>’
rather than ‘<tt>-</tt>’ to introduce the flag suppresses printing of the values
of parameters when there is no parameter name. Also, if the last option
is the word ‘<tt>+</tt>’, then names are printed but values are not.
</p>
<p>If the <tt>-m</tt> flag is given the <var>name</var> arguments are taken as patterns
(which should be quoted). With no attribute flags, all parameters (or
functions with the <tt>-f</tt> flag) with matching names are printed (the shell
option <tt>TYPESET_SILENT</tt> is not used in this case). Note that <tt>-m</tt> is
ignored if no patterns are given. If the <tt>+g</tt> flag is combined with
<tt>-m</tt>, a new local parameter is created for every matching parameter that
is not already local. Otherwise <tt>-m</tt> applies all other flags or
assignments to the existing parameters. Except when assignments are made
with <var>name</var><tt>=</tt><var>value</var>, using <tt>+m</tt> forces the matching parameters
to be printed, even inside a function.
</p>
<p>If no attribute flags are given and either no <tt>-m</tt> flag is present or
the <tt>+m</tt> form was used, each parameter name printed is preceded by a
list of the attributes of that parameter (<tt>array</tt>, <tt>association</tt>,
<tt>exported</tt>, <tt>integer</tt>, <tt>readonly</tt>). If <tt>+m</tt> is used with attribute
flags, and all those flags are introduced with <tt>+</tt>, the matching
parameter names are printed but their values are not.
</p>
<p>Attribute flags that transform the final value (<tt>-L</tt>, <tt>-R</tt>, <tt>-Z</tt>,
<tt>-l</tt>, <tt>u</tt>) are only applied to the expanded value at the point
of a parameter expansion expression using ‘<tt>$</tt>’. They are not applied
when a parameter is retrieved internally by the shell for any purpose.
</p>
<p>The following attribute flags may be specified:
</p>
<dl compact="compact">
<dt> <tt>-A</tt></dt>
<dd><p>The names refer to associative array parameters; see
<a href="Parameters.html#Array-Parameters">Array Parameters</a>.
</p>
</dd>
<dt> <tt>-L</tt></dt>
<dd><p>Left justify and remove leading blanks from <var>value</var>.
If <var>n</var> is nonzero, it defines the width of the field.
If <var>n</var> is zero, the width is determined by the width of the value of
the first assignment. In the case of numeric parameters, the length of the
complete value assigned to the parameter is used to determine the width,
not the value that would be output.
</p>
<p>The width is the count of characters, which may be multibyte characters
if the <tt>MULTIBYTE</tt> option is in effect. Note that the screen
width of the character is not taken into account; if this is required,
use padding with parameter expansion flags
<tt>${(ml</tt><var>...</var><tt>)</tt><var>...</var><tt>}</tt> as described in
‘Parameter Expansion Flags’ in
<a href="Expansion.html#Parameter-Expansion">Parameter Expansion</a>.
</p>
<p>When the parameter is expanded, it is filled on the right with
blanks or truncated if necessary to fit the field.
Note truncation can lead to unexpected results with numeric parameters.
Leading zeros are removed if the <tt>-Z</tt> flag is also set.
</p>
</dd>
<dt> <tt>-R</tt></dt>
<dd><p>Similar to <tt>-L</tt>, except that right justification is used;
when the parameter is expanded, the field is left filled with
blanks or truncated from the end. May not be combined with the <tt>-Z</tt>
flag.
</p>
</dd>
<dt> <tt>-U</tt></dt>
<dd><p>For arrays (but not for associative arrays), keep only the first
occurrence of each duplicated value. This may also be set for
colon-separated special parameters like <tt>PATH</tt> or <tt>FIGNORE</tt>, etc.
This flag has a different meaning when used with <tt>-f</tt>; see below.
</p>
</dd>
<dt> <tt>-Z</tt></dt>
<dd><p>Specially handled if set along with the <tt>-L</tt> flag.
Otherwise, similar to <tt>-R</tt>, except that leading zeros are used for
padding instead of blanks if the first non-blank character is a digit.
Numeric parameters are specially handled: they are always eligible
for padding with zeroes, and the zeroes are inserted at an appropriate
place in the output.
</p>
</dd>
<dt> <tt>-a</tt></dt>
<dd><p>The names refer to array parameters. An array parameter may be
created this way, but it may not be assigned to in the <tt>typeset</tt>
statement. When displaying, both normal and associative arrays are
shown.
</p>
</dd>
<dt> <tt>-f</tt></dt>
<dd><p>The names refer to functions rather than parameters. No assignments
can be made, and the only other valid flags are <tt>-t</tt>, <tt>-T</tt>, <tt>-k</tt>,
<tt>-u</tt>, <tt>-U</tt> and <tt>-z</tt>. The flag <tt>-t</tt> turns on execution tracing
for this function; the flag <tt>-T</tt> does the same, but turns off tracing
on any function called from the present one, unless that function also
has the <tt>-t</tt> or <tt>-T</tt> flag. The <tt>-u</tt> and <tt>-U</tt> flags cause the
function to be marked for autoloading; <tt>-U</tt> also causes alias
expansion to be suppressed when the function is loaded. The <tt>fpath</tt>
parameter will be searched to find the function definition when the
function is first referenced; see <a href="Functions.html#Functions">Functions</a>. The <tt>-k</tt> and
<tt>-z</tt> flags make the function be loaded using ksh-style or zsh-style
autoloading respectively. If neither is given, the setting of the
KSH_AUTOLOAD option determines how the function is loaded.
</p>
</dd>
<dt> <tt>-h</tt></dt>
<dd><p>Hide: only useful for special parameters (those marked ‘<S>’ in the table in
<a href="Parameters.html#Parameters-Set-By-The-Shell">Parameters Set By The Shell</a>), and for local parameters with the same name as a special parameter,
though harmless for others. A special parameter with this attribute will
not retain its special effect when made local. Thus after ‘<tt>typeset -h
PATH</tt>’, a function containing ‘<tt>typeset PATH</tt>’ will create an ordinary
local parameter without the usual behaviour of <tt>PATH</tt>. Alternatively,
the local parameter may itself be given this attribute; hence inside a
function ‘<tt>typeset -h PATH</tt>’ creates an ordinary local parameter and the
special <tt>PATH</tt> parameter is not altered in any way. It is also possible
to create a local parameter using ‘<tt>typeset +h </tt><var>special</var>’, where the
local copy of <var>special</var> will retain its special properties regardless of
having the <tt>-h</tt> attribute. Global special parameters loaded from shell
modules (currently those in <tt>zsh/mapfile</tt> and <tt>zsh/parameter</tt>) are
automatically given the <tt>-h</tt> attribute to avoid name clashes.
</p>
</dd>
<dt> <tt>-H</tt></dt>
<dd><p>Hide value: specifies that <tt>typeset</tt> will not display the value of the
parameter when listing parameters; the display for such parameters is
always as if the ‘<tt>+</tt>’ flag had been given. Use of the parameter is
in other respects normal, and the option does not apply if the parameter is
specified by name, or by pattern with the <tt>-m</tt> option. This is on by
default for the parameters in the <tt>zsh/parameter</tt> and <tt>zsh/mapfile</tt>
modules. Note, however, that unlike the <tt>-h</tt> flag this is also useful
for non-special parameters.
</p>
</dd>
<dt> <tt>-i</tt></dt>
<dd><p>Use an internal integer representation. If <var>n</var> is nonzero it
defines the output arithmetic base, otherwise it is determined by the
first assignment. Bases from 2 to 36 inclusive are allowed.
</p>
</dd>
<dt> <tt>-E</tt></dt>
<dd><p>Use an internal double-precision floating point representation. On output
the variable will be converted to scientific notation. If <var>n</var> is
nonzero it defines the number of significant figures to display; the
default is ten.
</p>
</dd>
<dt> <tt>-F</tt></dt>
<dd><p>Use an internal double-precision floating point representation. On output
the variable will be converted to fixed-point decimal notation. If <var>n</var>
is nonzero it defines the number of digits to display after the decimal
point; the default is ten.
</p>
</dd>
<dt> <tt>-l</tt></dt>
<dd><p>Convert the result to lower case whenever the parameter is expanded.
The value is <em>not</em> converted when assigned.
</p>
</dd>
<dt> <tt>-r</tt></dt>
<dd><p>The given <var>name</var>s are marked readonly. Note that if <var>name</var> is a
special parameter, the readonly attribute can be turned on, but cannot then
be turned off.
</p>
</dd>
<dt> <tt>-t</tt></dt>
<dd><p>Tags the named parameters. Tags have no special meaning to the shell.
This flag has a different meaning when used with <tt>-f</tt>; see above.
</p>
</dd>
<dt> <tt>-u</tt></dt>
<dd><p>Convert the result to upper case whenever the parameter is expanded.
The value is <em>not</em> converted when assigned.
This flag has a different meaning when used with <tt>-f</tt>; see above.
</p>
</dd>
<dt> <tt>-x</tt></dt>
<dd><p>Mark for automatic export to the environment of subsequently
executed commands. If the option <tt>GLOBAL_EXPORT</tt> is set, this implies
the option <tt>-g</tt>, unless <tt>+g</tt> is also explicitly given; in other words
the parameter is not made local to the enclosing function. This is for
compatibility with previous versions of zsh.
</p>
</dd>
</dl>
<a name="index-ulimit"></a>
<a name="index-resource-limits-1"></a>
<a name="index-limits_002c-resource-1"></a>
</dd>
<dt> <tt>ulimit</tt> [ [ <tt>-SHacdfilmnpqrstvx</tt> | <tt>-N</tt> <var>resource</var> [ <var>limit</var> ] ... ]</dt>
<dd><p>Set or display resource limits of the shell and the processes started by
the shell. The value of <var>limit</var> can be a number in the unit specified
below or one of the values ‘<tt>unlimited</tt>’, which removes the limit on the
resource, or ‘<tt>hard</tt>’, which uses the current value of the hard limit on
the resource.
</p>
<p>By default, only soft limits are manipulated. If the <tt>-H</tt> flag
is given use hard limits instead of soft limits. If the <tt>-S</tt> flag is given
together with the <tt>-H</tt> flag set both hard and soft limits.
</p>
<p>If no options are used, the file size limit (<tt>-f</tt>) is assumed.
</p>
<p>If <var>limit</var> is omitted the current value of the specified resources are
printed. When more than one resource value is printed, the limit name and
unit is printed before each value.
</p>
<p>When looping over multiple resources, the shell will abort immediately if
it detects a badly formed argument. However, if it fails to set a limit
for some other reason it will continue trying to set the remaining limits.
</p>
<p>Not all the following resources are supported on all systems. Running
<tt>ulimit -a</tt> will show which are supported.
</p>
<dl compact="compact">
<dt> <tt>-a</tt></dt>
<dd><p>Lists all of the current resource limits.
</p></dd>
<dt> <tt>-b</tt></dt>
<dd><p>Socket buffer size in bytes (N.B. not kilobytes)
</p></dd>
<dt> <tt>-c</tt></dt>
<dd><p>512-byte blocks on the size of core dumps.
</p></dd>
<dt> <tt>-d</tt></dt>
<dd><p>Kilobytes on the size of the data segment.
</p></dd>
<dt> <tt>-f</tt></dt>
<dd><p>512-byte blocks on the size of files written.
</p></dd>
<dt> <tt>-i</tt></dt>
<dd><p>The number of pending signals.
</p></dd>
<dt> <tt>-l</tt></dt>
<dd><p>Kilobytes on the size of locked-in memory.
</p></dd>
<dt> <tt>-m</tt></dt>
<dd><p>Kilobytes on the size of physical memory.
</p></dd>
<dt> <tt>-n</tt></dt>
<dd><p>open file descriptors.
</p></dd>
<dt> <tt>-q</tt></dt>
<dd><p>Bytes in POSIX message queues.
</p></dd>
<dt> <tt>-s</tt></dt>
<dd><p>Kilobytes on the size of the stack.
</p></dd>
<dt> <tt>-t</tt></dt>
<dd><p>CPU seconds to be used.
</p></dd>
<dt> <tt>-r</tt></dt>
<dd><p>The number of simultaneous threads available to the user.
</p></dd>
<dt> <tt>-u</tt></dt>
<dd><p>The number of processes available to the user.
</p></dd>
<dt> <tt>-v</tt></dt>
<dd><p>Kilobytes on the size of virtual memory. On some systems this
refers to the limit called ‘address space’.
</p></dd>
<dt> <tt>-x</tt></dt>
<dd><p>The number of locks on files.
</p></dd>
</dl>
<p>A resource may also be specified by integer in the form ‘<tt>-N</tt>
<var>resource</var>’, where <var>resource</var> corresponds to the integer defined for
the resource by the operating system. This may be used to set the limits
for resources known to the shell which do not correspond to option letters.
Such limits will be shown by number in the output of ‘<tt>ulimit -a</tt>’.
</p>
<p>The number may alternatively be out of the range of limits compiled into
the shell. The shell will try to read or write the limit anyway, and
will report an error if this fails.
</p>
<a name="index-umask"></a>
<a name="index-umask-1"></a>
</dd>
<dt> <tt>umask</tt> [ <tt>-S</tt> ] [ <var>mask</var> ]</dt>
<dd><p>The umask is set to <var>mask</var>. <var>mask</var> can be either
an octal number or a symbolic value as described in man page chmod(1).
If <var>mask</var> is omitted, the current value is printed. The <tt>-S</tt>
option causes the mask to be printed as a symbolic value. Otherwise,
the mask is printed as an octal number. Note that in
the symbolic form the permissions you specify are those which are to be
allowed (not denied) to the users specified.
</p>
<a name="index-aliases_002c-removing"></a>
<a name="index-unalias"></a>
</dd>
<dt> <tt>unalias</tt></dt>
<dd><p>Same as <tt>unhash -a</tt>.
</p>
<a name="index-functions_002c-removing"></a>
<a name="index-unfunction"></a>
</dd>
<dt> <tt>unfunction</tt></dt>
<dd><p>Same as <tt>unhash -f</tt>.
</p>
<a name="index-unhash"></a>
</dd>
<dt> <tt>unhash</tt> [ <tt>-adfms</tt> ] <var>name</var> ...</dt>
<dd><p>Remove the element named <var>name</var> from an internal hash table. The
default is remove elements from the command hash table. The <tt>-a</tt>
option causes <tt>unhash</tt> to remove regular or global aliases; note
when removing a global aliases that the argument must be quoted to prevent
it from being expanded before being passed to the command.
The <tt>-s</tt> option causes <tt>unhash</tt> to remove suffix aliases.
The <tt>-f</tt> option causes
<tt>unhash</tt> to remove shell functions. The <tt>-d</tt> options causes
<tt>unhash</tt> to remove named directories. If the <tt>-m</tt> flag is given
the arguments are taken as patterns (should be quoted) and all elements
of the corresponding hash table with matching names will be removed.
</p>
<a name="index-unlimit"></a>
<a name="index-resource-limits-2"></a>
<a name="index-limits_002c-resource-2"></a>
</dd>
<dt> <tt>unlimit</tt> [ <tt>-hs</tt> ] <var>resource</var> ...</dt>
<dd><p>The resource limit for each <var>resource</var> is set to the hard limit.
If the <tt>-h</tt> flag is given and the shell has appropriate privileges,
the hard resource limit for each <var>resource</var> is removed.
The resources of the shell process are only changed if the <tt>-s</tt>
flag is given.
</p>
<p>The <tt>unlimit</tt> command is not made available by default when the
shell starts in a mode emulating another shell. It can be made available
with the command ‘<tt>zmodload -F zsh/rlimits b:unlimit</tt>’.
</p>
<a name="index-unset"></a>
<a name="index-parameters_002c-unsetting"></a>
</dd>
<dt> <tt>unset</tt> [ <tt>-fmv</tt> ] <var>name</var> ...</dt>
<dd><p>Each named parameter is unset.
Local parameters remain local even if unset; they appear unset within scope,
but the previous value will still reappear when the scope ends.
</p>
<p>Individual elements of associative array parameters may be unset by using
subscript syntax on <var>name</var>, which should be quoted (or the entire command
prefixed with <tt>noglob</tt>) to protect the subscript from filename generation.
</p>
<p>If the <tt>-m</tt> flag is specified the arguments are taken as patterns (should
be quoted) and all parameters with matching names are unset. Note that this
cannot be used when unsetting associative array elements, as the subscript
will be treated as part of the pattern.
</p>
<p>The <tt>-v</tt> flag specifies that <var>name</var> refers to parameters. This is the
default behaviour.
</p>
<p><tt>unset -f</tt> is equivalent to <tt>unfunction</tt>.
</p>
<a name="index-unsetopt"></a>
<a name="index-options_002c-unsetting"></a>
</dd>
<dt> <tt>unsetopt</tt> [ {<tt>+</tt>|<tt>-</tt>}<var>options</var> | {<tt>+</tt>|<tt>-</tt>}<tt>o</tt> <var>option_name</var> ] [ <var>name</var> ... ]</dt>
<dd><p>Unset the options for the shell. All options specified either
with flags or by name are unset. If no arguments are supplied,
the names of all options currently unset are printed.
If the <tt>-m</tt> flag is given the arguments are taken as patterns
(which should be quoted to preserve them from being interpreted as glob
patterns), and all options with names matching these patterns are unset.
</p>
</dd>
<dt> <tt>vared</tt></dt>
<dd><p>See <a href="Zsh-Line-Editor.html#Zle-Builtins">Zle Builtins</a>.
</p>
<a name="index-wait"></a>
<a name="index-waiting-for-jobs"></a>
<a name="index-jobs_002c-waiting-for"></a>
</dd>
<dt> <tt>wait</tt> [ <var>job</var> ... ]</dt>
<dd><p>Wait for the specified jobs or processes. If <var>job</var> is not given
then all currently active child processes are waited for.
Each <var>job</var> can be either a job specification or the process ID
of a job in the job table.
The exit status from this command is that of the job waited for.
</p>
<a name="index-whence"></a>
</dd>
<dt> <tt>whence</tt> [ <tt>-vcwfpams</tt> ] <var>name</var> ...</dt>
<dd><p>For each name, indicate how it would be interpreted if used as a
command name.
</p>
<dl compact="compact">
<dt> <tt>-v</tt></dt>
<dd><p>Produce a more verbose report.
</p>
</dd>
<dt> <tt>-c</tt></dt>
<dd><p>Print the results in a <cite>csh</cite>-like format.
This takes precedence over <tt>-v</tt>.
</p>
</dd>
<dt> <tt>-w</tt></dt>
<dd><p>For each <var>name</var>, print ‘<var>name</var><tt>:</tt> <var>word</var>’ where <var>word</var>
is one of <tt>alias</tt>, <tt>builtin</tt>, <tt>command</tt>, <tt>function</tt>,
<tt>hashed</tt>, <tt>reserved</tt> or <tt>none</tt>, according as <var>name</var>
corresponds to an alias, a built-in command, an external command, a
shell function, a command defined with the <tt>hash</tt> builtin, a
reserved word, or is not recognised. This takes precedence over
<tt>-v</tt> and <tt>-c</tt>.
</p>
</dd>
<dt> <tt>-f</tt></dt>
<dd><p>Causes the contents of a shell function to be
displayed, which would otherwise not happen unless the <tt>-c</tt>
flag were used.
</p>
</dd>
<dt> <tt>-p</tt></dt>
<dd><p>Do a path search for <var>name</var>
even if it is an alias, reserved word, shell function or builtin.
</p>
</dd>
<dt> <tt>-a</tt></dt>
<dd><p>Do a search for all occurrences of <var>name</var>
throughout the command path.
Normally only the first occurrence is printed.
</p>
</dd>
<dt> <tt>-m</tt></dt>
<dd><p>The arguments are taken as patterns (should be
quoted), and the information is displayed for each command matching one
of these patterns.
</p>
</dd>
<dt> <tt>-s</tt></dt>
<dd><p>If a pathname contains symlinks, print the symlink-free pathname as well.
</p>
</dd>
</dl>
<a name="index-where"></a>
</dd>
<dt> <tt>where</tt> [ <tt>-wpms</tt> ] <var>name</var> ...</dt>
<dd><p>Equivalent to <tt>whence -ca</tt>.
</p>
<a name="index-which"></a>
</dd>
<dt> <tt>which</tt> [ <tt>-wpams</tt> ] <var>name</var> ...</dt>
<dd><p>Equivalent to <tt>whence -c</tt>.
</p>
<a name="index-zcompile"></a>
<a name="index-_002ezwc-files_002c-creation"></a>
<a name="index-compilation"></a>
</dd>
<dt> <tt>zcompile</tt> [ <tt>-U</tt> ] [ <tt>-z</tt> | <tt>-k</tt> ] [ <tt>-R</tt> | <tt>-M</tt> ] <var>file</var> [ <var>name</var> ... ]</dt>
<dt> <tt>zcompile</tt> <tt>-ca</tt> [ <tt>-m</tt> ] [ <tt>-R</tt> | <tt>-M</tt> ] <var>file</var> [ <var>name</var> ... ]</dt>
<dt> <tt>zcompile -t</tt> <var>file</var> [ <var>name</var> ... ]</dt>
<dd><p>This builtin command can be used to compile functions or scripts,
storing the compiled form in a file, and to examine files containing
the compiled form. This allows faster autoloading of functions and
execution of scripts by avoiding parsing of the text when the files
are read.
</p>
<p>The first form (without the <tt>-c</tt>, <tt>-a</tt> or <tt>-t</tt> options) creates a
compiled file. If only the <var>file</var> argument is given, the
output file has the name ‘<var>file</var><tt>.zwc</tt>’ and will be placed in
the same directory as the <var>file</var>. The shell will load the compiled
file instead of the normal function file when the function
is autoloaded; see
<a href="Functions.html#Functions">Functions</a>
for a description of how autoloaded functions are searched. The
extension <tt>.zwc</tt> stands for ‘zsh word code’.
</p>
<p>If there is at least one <var>name</var> argument, all the named files
are compiled into the output <var>file</var> given as the first argument. If
<var>file</var> does not end in <tt>.zwc</tt>, this extension is automatically
appended. Files containing multiple compiled functions are called ‘digest’
files, and are intended to be used as elements of the <tt>FPATH</tt>/<tt>fpath</tt>
special array.
</p>
<p>The second form, with the <tt>-c</tt> or <tt>-a</tt> options, writes the compiled
definitions for all the named functions into <var>file</var>. For <tt>-c</tt>, the
names must be functions currently defined in the shell, not those marked
for autoloading. Undefined functions that are marked for autoloading
may be written by using the <tt>-a</tt> option, in which case the <tt>fpath</tt>
is searched and the contents of the definition files for those
functions, if found, are compiled into <var>file</var>. If both <tt>-c</tt> and
<tt>-a</tt> are given, names of both defined functions and functions marked
for autoloading may be given. In either case, the functions in files
written with the <tt>-c</tt> or <tt>-a</tt> option will be autoloaded as if the
<tt>KSH_AUTOLOAD</tt> option were unset.
</p>
<p>The reason for handling loaded and not-yet-loaded functions with
different options is that some definition files for autoloading define
multiple functions, including the function with the same name as the
file, and, at the end, call that function. In such cases the output of
‘<tt>zcompile -c</tt>’ does not include the additional functions defined in
the file, and any other initialization code in the file is lost. Using
‘<tt>zcompile -a</tt>’ captures all this extra information.
</p>
<p>If the <tt>-m</tt> option is combined with <tt>-c</tt> or <tt>-a</tt>,
the <var>name</var>s are used as patterns and all functions whose names
match one of these patterns will be written. If no <var>name</var> is given,
the definitions of all functions currently defined or marked as
autoloaded will be written.
</p>
<p>The third form, with the <tt>-t</tt> option, examines an existing
compiled file. Without further arguments, the names of the original
files compiled into it are listed. The first line of output shows
the version of the shell which compiled the file and how the file
will be used (i.e. by reading it directly or by mapping it into memory).
With arguments, nothing is output and the return status is set to zero if
definitions for <em>all</em> <var>name</var>s were found in the compiled
file, and non-zero if the definition for at least one <var>name</var> was not
found.
</p>
<p>Other options:
</p>
<dl compact="compact">
<dt> <tt>-U</tt></dt>
<dd><p>Aliases are not expanded when compiling the <var>name</var>d files.
</p>
</dd>
<dt> <tt>-R</tt></dt>
<dd><p>When the compiled file is read, its contents are copied into the
shell’s memory, rather than memory-mapped (see <tt>-M</tt>). This
happens automatically on systems that do not support memory mapping.
</p>
<p>When compiling scripts instead of autoloadable functions, it is
often desirable to use this option; otherwise the whole file, including the
code to define functions which have already been defined, will
remain mapped, consequently wasting memory.
</p>
</dd>
<dt> <tt>-M</tt></dt>
<dd><p>The compiled file is mapped into the shell’s memory when read. This
is done in such a way that multiple instances of the shell running
on the same host will share this mapped file. If neither <tt>-R</tt> nor
<tt>-M</tt> is given, the <tt>zcompile</tt> builtin decides what to do based
on the size of the compiled file.
</p>
</dd>
<dt> <tt>-k</tt></dt>
<dt> <tt>-z</tt></dt>
<dd><p>These options are used when the compiled file contains functions which
are to be autoloaded. If <tt>-z</tt> is given, the
function will be autoloaded as if the <tt>KSH_AUTOLOAD</tt> option is
<em>not</em> set, even if it is set at the time the compiled file is
read, while if the <tt>-k</tt> is given, the function will be loaded as if
<tt>KSH_AUTOLOAD</tt> <em>is</em> set. These options also take precedence over
any <tt>-k</tt> or <tt>-z</tt> options specified to the <tt>autoload</tt> builtin. If
neither of these options is given, the function will be loaded as
determined by the setting of the <tt>KSH_AUTOLOAD</tt> option at the time
the compiled file is read.
</p>
<p>These options may also appear as many times as necessary between the listed
<var>name</var>s to specify the loading style of all following functions, up to
the next <tt>-k</tt> or <tt>-z</tt>.
</p>
</dd>
</dl>
<p>The created file always contains two versions of the compiled
format, one for big-endian machines and one for small-endian
machines. The upshot of this is that the compiled file is machine
independent and if it is read or mapped, only one half of the file
is actually used (and mapped).
</p>
</dd>
<dt> <tt>zformat</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fzutil-Module">The zsh/zutil Module</a>.
</p>
</dd>
<dt> <tt>zftp</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fzftp-Module">The zsh/zftp Module</a>.
</p>
</dd>
<dt> <tt>zle</tt></dt>
<dd><p>See <a href="Zsh-Line-Editor.html#Zle-Builtins">Zle Builtins</a>.
</p>
<a name="index-zmodload"></a>
<a name="index-modules_002c-loading"></a>
<a name="index-loading-modules"></a>
</dd>
<dt> <tt>zmodload</tt> [ <tt>-dL</tt> ] [ ... ]</dt>
<dt> <tt>zmodload -F</tt> [ <tt>-lLme</tt> <tt>-P</tt> <tt>param</tt> ] <var>module</var> [<tt>+-</tt>]<var>feature...</var></dt>
<dt> <tt>zmodload -e</tt> [ <tt>-A</tt> ] [ ... ]</dt>
<dt> <tt>zmodload</tt> [ <tt>-a</tt> [ <tt>-bcpf</tt> [ <tt>-I</tt> ] ] ] [ <tt>-iL</tt> ] ...</dt>
<dt> <tt>zmodload</tt> <tt>-u</tt> [ <tt>-abcdpf</tt> [ <tt>-I</tt> ] ] [ <tt>-iL</tt> ] ...</dt>
<dt> <tt>zmodload</tt> <tt>-A</tt> [ <tt>-L</tt> ] [ <var>modalias</var>[<tt>=</tt><var>module</var>] ... ]</dt>
<dt> <tt>zmodload</tt> <tt>-R</tt> <var>modalias</var> ... </dt>
<dd><p>Performs operations relating to zsh’s loadable modules.
Loading of modules while the shell is running (‘dynamical loading’) is not
available on all operating systems, or on all installations on a particular
operating system, although the <tt>zmodload</tt> command itself is always
available and can be used to manipulate modules built into versions of the
shell executable without dynamical loading.
</p>
<p>Without arguments the names of all currently loaded binary modules are
printed. The <tt>-L</tt> option causes this list to be in the form of a
series of <tt>zmodload</tt> commands. Forms with arguments are:
</p>
<dl compact="compact">
<dt> <tt>zmodload</tt> [ <tt>-i</tt> ] <var>name</var> ... </dt>
<dt> <tt>zmodload</tt> <tt>-u</tt> [ <tt>-i</tt> ] <var>name</var> ...</dt>
<dd><p>In the simplest case, <tt>zmodload</tt> loads a binary module. The module must
be in a file with a name consisting of the specified <var>name</var> followed by
a standard suffix, usually ‘<tt>.so</tt>’ (‘<tt>.sl</tt>’ on HPUX).
If the module to be loaded is already loaded the duplicate module is
ignored. If <tt>zmodload</tt> detects an inconsistency, such as an
invalid module name or circular dependency list, the current code block is
aborted. Hence ‘<tt>zmodload</tt> <var>module</var> <tt>2>/dev/null</tt>’ is sufficient
to test whether a module is available.
If it is available, the module is loaded if necessary, while if it
is not available, non-zero status is silently returned. The option
<tt>-i</tt> is accepted for compatibility but has no effect.
</p>
<p>The <var>name</var>d module is searched for in the same way a command is, using
<tt>$module_path</tt> instead of <tt>$path</tt>. However, the path search is
performed even when the module name contains a ‘<tt>/</tt>’, which it usually does.
There is no way to prevent the path search.
</p>
<p>If the module supports features (see below), <tt>zmodload</tt> tries to
enable all features when loading a module. If the module was successfully
loaded but not all features could be enabled, <tt>zmodload</tt> returns status 2.
</p>
<p>With <tt>-u</tt>, <tt>zmodload</tt> unloads modules. The same <var>name</var>
must be given that was given when the module was loaded, but it is not
necessary for the module to exist in the file system.
The <tt>-i</tt> option suppresses the error if the module is already
unloaded (or was never loaded).
</p>
<p>Each module has a boot and a cleanup function. The module
will not be loaded if its boot function fails. Similarly a module
can only be unloaded if its cleanup function runs successfully.
</p>
</dd>
<dt> <tt>zmodload -F</tt> [ <tt>-almLe</tt> <tt>-P</tt> <tt>param</tt> ] <var>module</var> [<tt>+-</tt>]<var>feature...</var></dt>
<dd><p><tt>zmodload -F</tt> allows more selective control over the features provided
by modules. With no options apart from <tt>-F</tt>, the module named
<var>module</var> is loaded, if it was not already loaded, and the list of
<var>feature</var>s is set to the required state. If no
<var>feature</var>s are specified, the module is loaded, if it was not already
loaded, but the state of features is unchanged. Each feature
may be preceded by a <tt>+</tt> to turn the feature on, or <tt>-</tt> to turn it
off; the <tt>+</tt> is assumed if neither character is present.
Any feature not explicitly mentioned is left in its current state;
if the module was not previously loaded this means any such features will
remain disabled. The return status is zero if all features were
set, 1 if the module failed to load, and 2 if some features could
not be set (for example, a parameter couldn’t be added because there
was a different parameter of the same name) but the module was loaded.
</p>
<p>The standard features are builtins, conditions, parameters and math
functions; these are indicated by the prefix ‘<tt>b:</tt>’, ‘<tt>c:</tt>’
(‘<tt>C:</tt>’ for an infix condition), ‘<tt>p:</tt>’ and ‘<tt>f:</tt>’, respectively,
followed by the name that the corresponding feature would have in the
shell. For example, ‘<tt>b:strftime</tt>’ indicates a builtin named
<tt>strftime</tt> and <tt>p:EPOCHSECONDS</tt> indicates a parameter named
<tt>EPOCHSECONDS</tt>. The module may provide other (‘abstract’) features of
its own as indicated by its documentation; these have no prefix.
</p>
<p>With <tt>-l</tt> or <tt>-L</tt>, features provided by the module are listed. With
<tt>-l</tt> alone, a list of features together with their states is shown, one
feature per line. With <tt>-L</tt> alone, a <tt>zmodload -F</tt> command that would
cause enabled features of the module to be turned on is shown. With
<tt>-lL</tt>, a <tt>zmodload -F</tt> command that would cause all the features to be
set to their current state is shown. If one of these combinations is given
the option <tt>-P</tt> <var>param</var> then the parameter <tt>param</tt> is set to an
array of features, either features together with their state or (if
<tt>-L</tt> alone is given) enabled features.
</p>
<p>With the option <tt>-L</tt> the module name may be omitted; then a list
of all enabled features for all modules providing features is printed
in the form of <tt>zmodload -F</tt> commands. If <tt>-l</tt> is also given,
the state of both enabled and disabled features is output in that form.
</p>
<p>A set of features may be provided together with <tt>-l</tt> or <tt>-L</tt> and a
module name; in that case only the state of those features is
considered. Each feature may be preceded by <tt>+</tt> or <tt>-</tt> but the
character has no effect. If no set of features is provided, all
features are considered.
</p>
<p>With <tt>-e</tt>, the command first tests that the module is loaded;
if it is not, status 1 is returned. If the module is loaded,
the list of features given as an argument is examined. Any feature
given with no prefix is simply tested to see if the module provides it;
any feature given with a prefix <tt>+</tt> or <tt>-</tt> is tested to
see if is provided and in the given state. If the tests on all features
in the list succeed, status 0 is returned, else status 1.
</p>
<p>With <tt>-m</tt>, each entry in the given list of features is taken
as a pattern to be matched against the list of features provided
by the module. An initial <tt>+</tt> or <tt>-</tt> must be given explicitly.
This may not be combined with the <tt>-a</tt> option as autoloads must
be specified explicitly.
</p>
<p>With <tt>-a</tt>, the given list of features is marked for autoload from
the specified module, which may not yet be loaded. An optional <tt>+</tt>
may appear before the feature name. If the feature is prefixed with
<tt>-</tt>, any existing autoload is removed. The options <tt>-l</tt> and <tt>-L</tt>
may be used to list autoloads. Autoloading is specific to individual
features; when the module is loaded only the requested feature is
enabled. Autoload requests are preserved if the module is
subsequently unloaded until an explicit ‘<tt>zmodload -Fa</tt> <var>module</var>
<tt>-</tt><var>feature</var>’ is issued. It is not an error to request an autoload
for a feature of a module that is already loaded.
</p>
<p>When the module is loaded each autoload is checked against the features
actually provided by the module; if the feature is not provided the
autoload request is deleted. A warning message is output; if the
module is being loaded to provide a different feature, and that autoload
is successful, there is no effect on the status of the current command.
If the module is already loaded at the time when <tt>zmodload -Fa</tt> is
run, an error message is printed and status 1 returned.
</p>
<p><tt>zmodload -Fa</tt> can be used with the <tt>-l</tt>, <tt>-L</tt>, <tt>-e</tt> and
<tt>-P</tt> options for listing and testing the existence of autoloadable
features. In this case <tt>-l</tt> is ignored if <tt>-L</tt> is specified.
<tt>zmodload -FaL</tt> with no module name lists autoloads for all modules.
</p>
<p>Note that only standard features as described above can be autoloaded;
other features require the module to be loaded before enabling.
</p>
</dd>
<dt> <tt>zmodload</tt> <tt>-d</tt> [ <tt>-L</tt> ] [ <var>name</var> ]</dt>
<dt> <tt>zmodload</tt> <tt>-d</tt> <var>name</var> <var>dep</var> ...</dt>
<dt> <tt>zmodload</tt> <tt>-ud</tt> <var>name</var> [ <var>dep</var> ... ]</dt>
<dd><p>The <tt>-d</tt> option can be used to specify module dependencies. The modules
named in the second and subsequent arguments will be loaded before the
module named in the first argument.
</p>
<p>With <tt>-d</tt> and one argument, all dependencies for that module are listed.
With <tt>-d</tt> and no arguments, all module dependencies are listed. This
listing is by default in a Makefile-like format. The <tt>-L</tt> option
changes this format to a list of <tt>zmodload -d</tt> commands.
</p>
<p>If <tt>-d</tt> and <tt>-u</tt> are both used, dependencies are removed. If only one
argument is given, all dependencies for that module are removed.
</p>
</dd>
<dt> <tt>zmodload</tt> <tt>-ab</tt> [ <tt>-L</tt> ]</dt>
<dt> <tt>zmodload</tt> <tt>-ab</tt> [ <tt>-i</tt> ] <var>name</var> [ <var>builtin</var> ... ]</dt>
<dt> <tt>zmodload</tt> <tt>-ub</tt> [ <tt>-i</tt> ] <var>builtin</var> ...</dt>
<dd><p>The <tt>-ab</tt> option defines autoloaded builtins. It defines the specified
<var>builtin</var>s. When any of those builtins is called, the module specified
in the first argument is loaded and all its features are enabled (for
selective control of features use ‘<tt>zmodload -F -a</tt>’ as described
above). If only the <var>name</var> is given, one builtin is defined, with
the same name as the module. <tt>-i</tt> suppresses the error if the builtin
is already defined or autoloaded, but not if another builtin of the
same name is already defined.
</p>
<p>With <tt>-ab</tt> and no arguments, all autoloaded builtins are listed, with the
module name (if different) shown in parentheses after the builtin name.
The <tt>-L</tt> option changes this format to a list of <tt>zmodload -a</tt>
commands.
</p>
<p>If <tt>-b</tt> is used together with the <tt>-u</tt> option, it removes builtins
previously defined with <tt>-ab</tt>. This is only possible if the builtin is
not yet loaded. <tt>-i</tt> suppresses the error if the builtin is already
removed (or never existed).
</p>
<p>Autoload requests are retained if the module is subsequently unloaded
until an explicit ‘<tt>zmodload -ub</tt> <var>builtin</var>’ is issued.
</p>
</dd>
<dt> <tt>zmodload</tt> <tt>-ac</tt> [ <tt>-IL</tt> ]</dt>
<dt> <tt>zmodload</tt> <tt>-ac</tt> [ <tt>-iI</tt> ] <var>name</var> [ <var>cond</var> ... ]</dt>
<dt> <tt>zmodload</tt> <tt>-uc</tt> [ <tt>-iI</tt> ] <var>cond</var> ...</dt>
<dd><p>The <tt>-ac</tt> option is used to define autoloaded condition codes. The
<var>cond</var> strings give the names of the conditions defined by the
module. The optional <tt>-I</tt> option is used to define infix condition
names. Without this option prefix condition names are defined.
</p>
<p>If given no condition names, all defined names are listed (as a series of
<tt>zmodload</tt> commands if the <tt>-L</tt> option is given).
</p>
<p>The <tt>-uc</tt> option removes definitions for autoloaded conditions.
</p>
</dd>
<dt> <tt>zmodload</tt> <tt>-ap</tt> [ <tt>-L</tt> ]</dt>
<dt> <tt>zmodload</tt> <tt>-ap</tt> [ <tt>-i</tt> ] <var>name</var> [ <var>parameter</var> ... ]</dt>
<dt> <tt>zmodload</tt> <tt>-up</tt> [ <tt>-i</tt> ] <var>parameter</var> ...</dt>
<dd><p>The <tt>-p</tt> option is like the <tt>-b</tt> and <tt>-c</tt> options, but makes
<tt>zmodload</tt> work on autoloaded parameters instead.
</p>
</dd>
<dt> <tt>zmodload</tt> <tt>-af</tt> [ <tt>-L</tt> ]</dt>
<dt> <tt>zmodload</tt> <tt>-af</tt> [ <tt>-i</tt> ] <var>name</var> [ <var>function</var> ... ]</dt>
<dt> <tt>zmodload</tt> <tt>-uf</tt> [ <tt>-i</tt> ] <var>function</var> ...</dt>
<dd><p>The <tt>-f</tt> option is like the <tt>-b</tt>, <tt>-p</tt>, and <tt>-c</tt> options, but
makes <tt>zmodload</tt> work on autoloaded math functions instead.
</p>
</dd>
<dt> <tt>zmodload</tt> <tt>-a</tt> [ <tt>-L</tt> ]</dt>
<dt> <tt>zmodload</tt> <tt>-a</tt> [ <tt>-i</tt> ] <var>name</var> [ <var>builtin</var> ... ]</dt>
<dt> <tt>zmodload</tt> <tt>-ua</tt> [ <tt>-i</tt> ] <var>builtin</var> ...</dt>
<dd><p>Equivalent to <tt>-ab</tt> and <tt>-ub</tt>.
</p>
</dd>
<dt> <tt>zmodload -e</tt> [ <tt>-A</tt> ] [ <var>string</var> ... ]</dt>
<dd><p>The <tt>-e</tt> option without arguments lists all loaded modules; if the <tt>-A</tt>
option is also given, module aliases corresponding to loaded modules are
also shown. If arguments are provided, nothing is printed;
the return status is set to zero if all <var>string</var>s given as arguments
are names of loaded modules and to one if at least on <var>string</var> is not
the name of a loaded module. This can be used to test for the
availability of things implemented by modules. In this case, any
aliases are automatically resolved and the <tt>-A</tt> flag is not used.
</p>
</dd>
<dt> <tt>zmodload</tt> <tt>-A</tt> [ <tt>-L</tt> ] [ <var>modalias</var>[<tt>=</tt><var>module</var>] ... ]</dt>
<dd><p>For each argument, if both <var>modalias</var> and <var>module</var> are given,
define <var>modalias</var> to be an alias for the module <var>module</var>.
If the module <var>modalias</var> is ever subsequently requested, either via a
call to <tt>zmodload</tt> or implicitly, the shell will attempt to load
<var>module</var> instead. If <var>module</var> is not given, show the definition of
<var>modalias</var>. If no arguments are given, list all defined module aliases.
When listing, if the <tt>-L</tt> flag was also given, list the definition as a
<tt>zmodload</tt> command to recreate the alias.
</p>
<p>The existence of aliases for modules is completely independent of whether
the name resolved is actually loaded as a module: while the alias exists,
loading and unloading the module under any alias has exactly the same
effect as using the resolved name, and does not affect the connection
between the alias and the resolved name which can be removed either by
<tt>zmodload -R</tt> or by redefining the alias. Chains of aliases (i.e. where
the first resolved name is itself an alias) are valid so long as these are
not circular. As the aliases take the same format as module names, they
may include path separators: in this case, there is no requirement for any
part of the path named to exist as the alias will be resolved first. For
example, ‘<tt>any/old/alias</tt>’ is always a valid alias.
</p>
<p>Dependencies added to aliased modules are actually added to the resolved
module; these remain if the alias is removed. It is valid to create an
alias whose name is one of the standard shell modules and which resolves to
a different module. However, if a module has dependencies, it
will not be possible to use the module name as an alias as the module will
already be marked as a loadable module in its own right.
</p>
<p>Apart from the above, aliases can be used in the <tt>zmodload</tt> command
anywhere module names are required. However, aliases will not be
shown in lists of loaded modules with a bare ‘<tt>zmodload</tt>’.
</p>
</dd>
<dt> <tt>zmodload</tt> <tt>-R</tt> <var>modalias</var> ... </dt>
<dd><p>For each <var>modalias</var> argument that was previously defined as a module
alias via <tt>zmodload -A</tt>, delete the alias. If any was not defined, an
error is caused and the remainder of the line is ignored.
</p>
</dd>
</dl>
<p>Note that <tt>zsh</tt> makes no distinction between modules that were linked
into the shell and modules that are loaded dynamically. In both cases
this builtin command has to be used to make available the builtins and
other things defined by modules (unless the module is autoloaded on
these definitions). This is true even for systems that don’t support
dynamic loading of modules.
</p>
</dd>
<dt> <tt>zparseopts</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fzutil-Module">The zsh/zutil Module</a>.
</p>
</dd>
<dt> <tt>zprof</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fzprof-Module">The zsh/zprof Module</a>.
</p>
</dd>
<dt> <tt>zpty</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fzpty-Module">The zsh/zpty Module</a>.
</p>
</dd>
<dt> <tt>zregexparse</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fzutil-Module">The zsh/zutil Module</a>.
</p>
</dd>
<dt> <tt>zsocket</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fnet_002fsocket-Module">The zsh/net/socket Module</a>.
</p>
</dd>
<dt> <tt>zstyle</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fzutil-Module">The zsh/zutil Module</a>.
</p>
</dd>
<dt> <tt>ztcp</tt></dt>
<dd><p>See <a href="Zsh-Modules.html#The-zsh_002fnet_002ftcp-Module">The zsh/net/tcp Module</a>.
</p>
</dd>
</dl>
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