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<title>execline: the wait command</title>
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<p>
<a href="index.html">execline</a><br />
<a href="http://skarnet.org/software/">Software</a><br />
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<h1> The <tt>wait</tt> program </h1>
<p>
<tt>wait</tt> waits for a set of children, then executes a program.
</p>
<h2> Interface </h2>
<p>
In an <a href="execlineb.html">execlineb</a> script:
</p>
<pre>
wait [ -I | -i ] [ -r | -t <em>timeout</em> ] { [ <em>pids...</em> ] } <em>prog...</em>
</pre>
<ul>
<li> <tt>wait</tt> reads a list of <em>pids</em> in a
(possibly empty) <a href="el_semicolon.html">block</a>,
and unquotes it. </li>
<li> <tt>wait</tt> waits for every child whose pid is
listed in <em>pids...</em>. If <em>pids...</em> is an
empty list, it waits for every child process it has. </li>
<li><tt>wait</tt> then execs into <em>prog...</em>. </li>
</ul>
<h2> Options </h2>
<ul>
<li> <tt>-r</tt> : equivalent to <tt>-t 0</tt>. Do not
pause: only reap processes that are already dead when <tt>wait</tt>
is invoked. </li>
<li> <tt>-t</tt> <em>timeout</em> : wait for a maximum
of <em>timeout</em> milliseconds. If there still are living processes
among <em>pids...</em> (or among <tt>wait</tt>'s children if
<em>pids...</em> is an empty list), after <em>timeout</em>
milliseconds, they will not be reaped. </li>
<li> <tt>-I</tt> : loose. If <tt>wait</tt> times out while
waiting for children to die, it will still
exec into <em>prog...</em>. This is the default. </li>
<li> <tt>-i</tt> : strict. If <tt>wait</tt> times out, it
will print an error message and exit 1. </li>
</ul>
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