doc/fdmove.html


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    <title>execline: the &gt;&amp; program</title>
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<h1> The <tt>&gt;&amp;</tt> program </h1>

<p>
<tt>&gt;&amp;</tt> moves or copies a given file descriptor, then
executes a program.
</p>

<h2> Interface </h2>

<pre>
     &gt;&amp; [ -c ] <em>fdto</em> <em>fdfrom</em> <em>prog...</em>
</pre>

<p>
<tt>&gt;&amp;</tt> moves the file descriptor number <em>fdfrom</em>,
to number <em>fdto</em>, then execs into <em>prog</em> with its arguments.
If <em>fdto</em> is open, <tt>&gt;&amp;</tt> closes it before moving
<em>fdfrom</em> to it.
</p>

<h2> Options </h2>

<ul>
 <li> <tt>-c</tt>&nbsp;: duplicate <em>fdfrom</em> to <em>fdto</em>
instead of moving it; do not close <em>fdfrom</em>. </li>
</ul>

<h2> Notes </h2>

<ul>
 <li> <tt>&gt;&amp; -c <em>a</em> <em>b</em> prog...</tt> is roughly equivalent to
<tt>sh -c 'exec prog... <em>a</em>&gt;&amp;<em>b</em>'</tt></li>
 <li> <tt>&gt;&amp; <em>a</em> <em>b</em> prog...</tt> is roughly equivalent to
<tt>sh -c 'exec prog... <em>a</em>&gt;&amp;<em>b</em> <em>b</em>&lt;&amp;-'</tt></li>
</ul>

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