doc/exec.html


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<p>
<a href="index.html">execline</a><br />
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<h1> The <tt>exec</tt> program </h1>

<p>
<tt>exec</tt> executes the command line it is given.
</p>

<h2> Interface </h2>

<pre>
     exec [ -c ] [ -l ] [ -a <em>argv0</em> ] <em>prog...</em>
</pre>

<p>
<tt>exec</tt> execs into <em>prog...</em>. It does nothing else.
<br /> Without options, <tt>exec</tt> can be seen as the execline NOP.
</p>

<h2> Options </h2>

<ul>
 <li> <tt>-c</tt>&nbsp;: empty the environment. <em>prog</em> is executed with no environment variables. <strong>Warning:&nbsp;</strong><em>prog</em> will run with an empty PATH, so make sure it does not rely on it. </li>
 <li> <tt>-l</tt>&nbsp;: login. Prepends <em>prog</em>'s argv[0] with a dash. </li>
 <li> <tt>-a <em>argv0</em></tt>&nbsp;: argv0. Replace <em>prog</em>'s argv[0] with <em>argv0</em>. This is done <em>before</em> adding a dash, if the <tt>-l</tt> option is also present. </li>
</ul>

<p>
The <tt>exec</tt> command, along with its options, is designed to emulate
the standard <tt>exec</tt> shell builtin, which replaces the shell with the
command it is given.
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