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<h3><a name="tcatn-usage">B.25.1 Usage</a></h3>
<p>The usage of <code>tcatn</code> is
<pre>
stilts <stilts-flags> tcatn nin=<count> ifmtN=<in-format> inN=<tableN>
icmdN=<cmds> ocmd=<cmds>
omode=out|meta|stats|count|cgi|discard|topcat|samp|tosql|gui
out=<out-table> ofmt=<out-format>
seqcol=<colname> loccol=<colname>
uloccol=<colname> countrows=true|false
</pre>
If you don't have the <code>stilts</code> script installed,
write "<code>java -jar stilts.jar</code>" instead of
"<code>stilts</code>" - see <a href="invoke.html">Section 3</a>.
The available <code><stilts-flags></code> are listed
in <a href="stilts-flags.html">Section 2.1</a>.
For programmatic invocation, the Task class for this
command is <code>uk.ac.starlink.ttools.task.TableCatN</code>.
</p>
<p>Parameter values are assigned on the command line
as explained in <a href="task-args.html">Section 2.3</a>.
They are as follows:
</p>
<p>
<dl>
<dt><strong><code>countrows = true|false</code> <em>(Boolean)</em></strong></dt>
<dd>Whether to count the rows in the table before starting
the output. This is essentially a tuning parameter -
if writing to an output format which requires the number
of rows up front (such as normal FITS) it may result in
skipping the number of passes through the input files required
for processing. Unless you have a good understanding of
the internals of the software, your best bet for working
out whether to set this true or false is to try it both
ways
<p>[Default: <code>false</code>]
</p>
</dd>
<dt><strong><code>icmdN = <cmds></code> <em>(<a href="http://andromeda.star.bris.ac.uk/starjavadocs/uk/ac/starlink/ttools/filter/ProcessingStep.html">ProcessingStep[]</a>)</em></strong></dt>
<dd>Specifies processing to be performed on
input table #N as specified by parameter <code>inN</code>,
before any other processing has taken place.
The value of this parameter is one or more of the filter
commands described in <a href="filterSteps.html">Section 6.1</a>.
If more than one is given, they must be separated by
semicolon characters (";").
This parameter can be repeated multiple times on the same
command line to build up a list of processing steps.
The sequence of commands given in this way
defines the processing pipeline which is performed on the table.
<p>Commands may alteratively be supplied in an external file,
by using the indirection character '@'.
Thus a value of "<code>@filename</code>"
causes the file <code>filename</code> to be read for a list
of filter commands to execute. The commands in the file
may be separated by newline characters and/or semicolons.
</p>
</dd>
<dt><strong><code>ifmtN = <in-format></code> <em>(String)</em></strong></dt>
<dd>Specifies the format of input table #N as specified by parameter <code>inN</code>.
The known formats are listed in <a href="inFormats.html">Section 5.2.1</a>.
This flag can be used if you know what format your
table is in.
If it has the special value
<code>(auto)</code> (the default),
then an attempt will be
made to detect the format of the table automatically.
This cannot always be done correctly however, in which case
the program will exit with an error explaining which
formats were attempted.
<p>[Default: <code>(auto)</code>]
</p>
</dd>
<dt><strong><code>inN = <tableN></code> <em>(<a href="http://www.starlink.ac.uk/stil/javadocs/uk/ac/starlink/table/StarTable.html">StarTable</a>)</em></strong></dt>
<dd>The location of input table #N.
This may take one of the following forms:
<ul>
<li>A filename.</li>
<li>A URL.</li>
<li>The special value "<code>-</code>",
meaning standard input.
In this case the input format must be given explicitly
using the <code>ifmtN</code>
parameter.
Note that not all formats can be streamed in this way.
</li>
<li>A system command line with
either a "<code><</code>" character at the start,
or a "<code>|</code>" character at the end
("<code><syscmd</code>" or
"<code>syscmd|</code>").
This executes the given pipeline and reads from its
standard output.
This will probably only work on unix-like systems.
</li>
</ul>
In any case, compressed data in one of the supported compression
formats (gzip, Unix compress or bzip2) will be decompressed
transparently.
</dd>
<dt><strong><code>loccol = <colname></code> <em>(String)</em></strong></dt>
<dd>Name of a column to be added to the output table
which will contain the location
(as specified in the input parameter(s))
of the input table from which each row originated.
</dd>
<dt><strong><code>nin = <count></code> <em>(Integer)</em></strong></dt>
<dd>The number of input tables for this task.
For each of the input tables N
there will be associated parameters
<code>ifmtN</code>, <code>inN</code> and <code>icmdN</code>.
</dd>
<dt><strong><code>ocmd = <cmds></code> <em>(<a href="http://andromeda.star.bris.ac.uk/starjavadocs/uk/ac/starlink/ttools/filter/ProcessingStep.html">ProcessingStep[]</a>)</em></strong></dt>
<dd>Specifies processing to be performed on
the output table,
after all other processing has taken place.
The value of this parameter is one or more of the filter
commands described in <a href="filterSteps.html">Section 6.1</a>.
If more than one is given, they must be separated by
semicolon characters (";").
This parameter can be repeated multiple times on the same
command line to build up a list of processing steps.
The sequence of commands given in this way
defines the processing pipeline which is performed on the table.
<p>Commands may alteratively be supplied in an external file,
by using the indirection character '@'.
Thus a value of "<code>@filename</code>"
causes the file <code>filename</code> to be read for a list
of filter commands to execute. The commands in the file
may be separated by newline characters and/or semicolons.
</p>
</dd>
<dt><strong><code>ofmt = <out-format></code> <em>(String)</em></strong></dt>
<dd>Specifies the format in which the output table will be written
(one of the ones in <a href="outFormats.html">Section 5.2.2</a> - matching is
case-insensitive and you can use just the first few letters).
If it has the special value
"<code>(auto)</code>"
(the default),
then the output filename will be
examined to try to guess what sort of file is required
usually by looking at the extension.
If it's not obvious from the filename what output format is
intended, an error will result.
<p>This parameter must only be given if
<code>omode</code>
has its default value of "<code>out</code>".
</p>
<p>[Default: <code>(auto)</code>]
</p>
</dd>
<dt><strong><code>omode = out|meta|stats|count|cgi|discard|topcat|samp|tosql|gui</code> <em>(<a href="http://andromeda.star.bris.ac.uk/starjavadocs/uk/ac/starlink/ttools/mode/ProcessingMode.html">ProcessingMode</a>)</em></strong></dt>
<dd>The mode in which the result table will be output.
The default mode is <code>out</code>, which means that
the result will be written as a new table to disk or elsewhere,
as determined by the <code>out</code> and <code>ofmt</code>
parameters.
However, there are other possibilities, which correspond
to uses to which a table can be put other than outputting it,
such as displaying metadata, calculating statistics,
or populating a table in an SQL database.
For some values of this parameter, additional parameters
(<code><mode-args></code>)
are required to determine the exact behaviour.
<p>Possible values are
<ul>
<li><code>out</code></li>
<li><code>meta</code></li>
<li><code>stats</code></li>
<li><code>count</code></li>
<li><code>cgi</code></li>
<li><code>discard</code></li>
<li><code>topcat</code></li>
<li><code>samp</code></li>
<li><code>tosql</code></li>
<li><code>gui</code></li>
</ul>
Use the <code>help=omode</code> flag
or see <a href="outModes.html">Section 6.4</a> for more information.
</p>
<p>[Default: <code>out</code>]
</p>
</dd>
<dt><strong><code>out = <out-table></code> <em>(<a href="http://andromeda.star.bris.ac.uk/starjavadocs/uk/ac/starlink/ttools/TableConsumer.html">TableConsumer</a>)</em></strong></dt>
<dd>The location of the output table. This is usually a filename
to write to.
If it is equal to the special value "-" (the default)
the output table will be written to standard output.
<p>This parameter must only be given if
<code>omode</code>
has its default value of "<code>out</code>".
</p>
<p>[Default: <code>-</code>]
</p>
</dd>
<dt><strong><code>seqcol = <colname></code> <em>(String)</em></strong></dt>
<dd>Name of a column to be added to the output table
which will contain the sequence number of the input table
from which each row originated.
This column will contain 1 for the rows from the first
concatenated table, 2 for the second, and so on.
</dd>
<dt><strong><code>uloccol = <colname></code> <em>(String)</em></strong></dt>
<dd>Name of a column to be added to the output table
which will contain the unique part of the location
(as specified in the input parameter(s))
of the input table from which each row originated.
If not null, parameters will also be added to the output table
giving the pre- and post-fix string common to all the locations.
For example, if the input tables are "/data/cat_a1.fits"
and "/data/cat_b2.fits" then the output table will contain
a new column <colname> which takes the value
"a1" for rows from the first table and
"b2" for rows from the second, and new parameters
"<colname>_prefix" and
"<colname>_postfix"
with the values "/data/cat_" and ".fits" respectively.
</dd>
</dl>
</p>
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<hr><i>STILTS - Starlink Tables Infrastructure Library Tool Set<br>Starlink User Note256<br>STILTS web page:
<a href="http://www.starlink.ac.uk/stilts/">http://www.starlink.ac.uk/stilts/</a><br>Author email:
<a href="mailto:m.b.taylor@bristol.ac.uk">m.b.taylor@bristol.ac.uk</a><br>Mailing list:
<a href="mailto:topcat-user@jiscmail.ac.uk">topcat-user@jiscmail.ac.uk</a><br></i></body>
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