/usr/share/zsh/help/functions is in zsh-common 5.0.7-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 | functions [ {+|-}UXkmtTuz ] [ name ... ]
functions -M mathfn [ min [ max [ shellfn ] ] ]
functions -M [ -m pattern ... ]
functions +M [ -m ] mathfn ...
Equivalent to typeset -f, with the exception of the -M option.
Use of the -M option may not be combined with any of the options
handled by typeset -f.
functions -M mathfn defines mathfn as the name of a mathematical
function recognised in all forms of arithmetical expressions;
see the section `Arithmetic Evaluation' in zshmisc(1). By
default mathfn may take any number of comma-separated arguments.
If min is given, it must have exactly min args; if min and max
are both given, it must have at least min and at most max args.
max may be -1 to indicate that there is no upper limit.
By default the function is implemented by a shell function of
the same name; if shellfn is specified it gives the name of the
corresponding shell function while mathfn remains the name used
in arithmetical expressions. The name of the function in $0 is
mathfn (not shellfn as would usually be the case), provided the
option FUNCTION_ARGZERO is in effect. The positional parameters
in the shell function correspond to the arguments of the mathe-
matical 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.
functions -M with no arguments lists all such user-defined func-
tions in the same form as a definition. With the additional
option -m and a list of arguments, all functions whose mathfn
matches one of the pattern arguments are listed.
function +M removes the list of mathematical functions; with the
additional option -m the arguments are treated as patterns and
all functions whose mathfn matches the pattern are removed.
Note that the shell function implementing the behaviour is not
removed (regardless of whether its name coincides with mathfn).
For example, the following prints the cube of 3:
zmath_cube() { (( $1 * $1 * $1 )) }
functions -M cube 1 1 zmath_cube
print $(( cube(3) ))
autoload [ {+|-}UXkmtz ] [ -w ] [ name ... ]
Equivalent to functions -u, with the exception of -X/+X and -w.
The flag -X may be used only inside a shell function, and may
not be followed by a name. 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 func-
tion remains undefined and marked for autoloading.
The flag +X attempts to load each name as an autoloaded func-
tion, but does not execute it. The exit status is zero (suc-
cess) if the function was not previously defined and a defini-
tion for it was found. This does not replace any existing defi-
nition 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 -m flag is also given each name is treated as a pattern and
all functions already marked for autoload that match the pattern
are loaded.
With the -w flag, the names are taken as names of files compiled
with the zcompile builtin, and all functions defined in them are
marked for autoloading.
The flags -z and -k mark the function to be autoloaded using the
zsh or ksh style, as if the option KSH_AUTOLOAD were unset or
were set, respectively. The flags override the setting of the
option at the time the function is loaded.
Note that the autoload 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 emulate command can be
used:
emulate zsh -c 'autoload -Uz func'
arranges that when func is loaded the shell is in native zsh
emulation, and this emulation is also applied when func is run.
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