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<title>execline: the withstdinas command</title>
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<p>
<a href="index.html">execline</a><br />
<a href="//skarnet.org/software/">Software</a><br />
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<h1> The <tt>withstdinas</tt> program </h1>
<p>
<tt>withstdinas</tt> reads the entirety of its standard input in an
environment variable, and runs another program with that additional
environment variable.
</p>
<h2> Interface </h2>
<p>
In an <a href="execlineb.html">execlineb</a> script:
</p>
<pre>
withstdinas [ -i | -I | -D <em>default</em> ] [ -n ] <em>variable</em> <em>prog...</em>
</pre>
<ul>
<li> <tt>withstdinas</tt> reads its stdin until EOF. </li>
<li> It then execs into <em>prog...</em>, with
<em>variable</em> added to the environment; the value of
<em>variable</em> is what was read on stdin. </li>
</ul>
<h2> Options </h2>
<ul>
<li> <tt>-n</tt> : chomp an ending newline off stdin. </li>
</ul>
<p>
The other options tell withstdinas what to do if its input is
not suitable as the contents of an environment variable, i.e. it
contains a null character:
</p>
<ul>
<li> <tt>-i</tt> : withstdinas exits 1. </li>
<li> <tt>-I</tt> : <em>variable</em> is <strong>removed</strong> from
the environment, and execution proceeds. </li>
<li> <tt>-D <em>default</em></tt> : the value of <em>variable</em>
is set to <em>default</em>, and execution proceeds. </li>
<li> neither of those options: the value of <em>variable</em> is set to whatever the
start of the input is, up to the first null character; and execution proceeds. </li>
</ul>
<h2> Notes </h2>
<ul>
<li> You can start <em>prog...</em> with "$ -u <em>variable</em> <em>variable</em>"
to perform variable substitution. </li>
</ul>
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