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<?xml version="1.0" encoding="utf-8"?>
<!--
Written by Joey Hess
-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.4//EN"
"file:///usr/share/xml/docbook/schema/dtd/4.4/docbookx.dtd"
[]>
<refentry>
<refentryinfo>
<address>
<email>joey@kitenet.net</email>
</address>
<author>
<firstname>Joey</firstname>
<surname>Hess</surname>
</author>
<date>2009-07-02</date>
</refentryinfo>
<refmeta>
<refentrytitle>parallel</refentrytitle>
<manvolnum>1</manvolnum>
</refmeta>
<refnamediv>
<refname>parallel</refname>
<refpurpose>run programs in parallel</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>parallel</command>
<arg>options</arg>
<arg>command</arg>
<command>--</command>
<arg>argument ...</arg>
</cmdsynopsis>
<cmdsynopsis>
<command>parallel</command>
<arg>options</arg>
<command>--</command>
<arg>command ...</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>DESCRIPTION</title>
<para><command>parallel</command> runs the specified command,
passing it a single one of the specified arguments. This is
repeated for each argument. Jobs may be run in
parallel. The default is to run one job per CPU.</para>
<para>If no command is specified before the --,
the commands after it are instead run in parallel.</para>
</refsect1>
<refsect1>
<title>OPTIONS</title>
<variablelist>
<varlistentry>
<term><option>-j maxjobs</option></term>
<listitem>
<para>Use to limit the number of jobs
that are run at the same time.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-l maxload</option></term>
<listitem>
<para>Wait as needed to avoid starting
new jobs when the system's load average
is not below the specified limit.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-i</option></term>
<listitem>
<para>Normally the command is passed the
argument at the end of its command line. With
this option, any instances of "{}" in
the command are replaced with the argument.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-n</option></term>
<listitem>
<para>Number of arguments to pass to a
command at a time. Default is 1.
Incompatible with -i</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>EXAMPLE</title>
<para>
<cmdsynopsis>
<command>parallel sh -c "echo hi; sleep 2; echo bye" -- 1 2 3</command>
</cmdsynopsis>
</para>
<para>This runs three subshells that each print a message, delay,
and print another message. If your system has multiple
CPUs, parallel will run some of the jobs in parallel,
which should be clear from the order the messages are
output.
</para>
<para>
<cmdsynopsis>
<command>parallel -j 3 ufraw -o processed -- *.NEF</command>
</cmdsynopsis>
</para>
<para>This runs three ufraw processes at the same time until
all of the NEF files have been processed.
</para>
<para>
<cmdsynopsis>
<command>parallel -j 3 -- ls df "echo hi"</command>
</cmdsynopsis>
</para>
<para>This runs three independent commands in parallel.</para>
</refsect1>
<refsect1>
<title>EXIT STATUS</title>
<para>Its exit status is the combination of the exit statuses of each
command ran, ORed together. (Thus, if any one command
exits nonzero, <command>parallel</command> as a whole will exit nonzero.)</para>
</refsect1>
<refsect1>
<title>AUTHOR</title>
<para>
Tollef Fog Heen
</para>
</refsect1>
</refentry>
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