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<title>execline: the posix-cd command</title>
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<a href="index.html">execline</a><br />
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<h1> The <tt>posix-cd</tt> program </h1>
<p>
<tt>posix-cd</tt> changes the current working directory to a
given directory, then executes a program.
</p>
<h2> Interface </h2>
<pre>
posix-cd [ -L | -P ] <em>dir</em> <em>prog...</em>
</pre>
<p>
<tt>posix-cd</tt> changes the current working directory to <em>dir</em>
according to the
<a href="https://pubs.opengroup.org/onlinepubs/9699919799/utilities/cd.html">POSIX
specification for a <tt>cd</tt> external utility</a>. Then, if <em>prog...</em> is
not empty, it execs into it.
</p>
<h2> Notes </h2>
<ul>
<li> <tt>posix-cd</tt> is only available when execline has been configured
with the <tt>--enable-pedantic-posix</tt> option, and in this case, the
<a href="cd.html">cd</a> binary is a symbolic link to it. </li>
<li> <tt>posix-cd</tt> fully conforms to the
<a href="https://pubs.opengroup.org/onlinepubs/9699919799/utilities/cd.html">POSIX
specification</a>. When <em>prog...</em> is not empty, the behaviour of a
<tt>cd</tt> utility is not specified by POSIX, so <tt>posix-cd</tt> extends
the spec to be actually useful and usable in an execline program with the same
interface as the regular execline <a href="cd.html">cd</a> command. </li>
<li> Nobody ever executes or needs the external version (i.e. not a shell
builtin) of the POSIX <tt>cd</tt> command. Compared to the regular execline
<a href="cd.html">cd</a>, <tt>posix-cd</tt> is uselessly bloated and slow.
The only reason it exists is that some distributions refuse to package
execline correctly unless it is strictly POSIX-compliant; the
<tt>--enable-pedantic-posix</tt> configure option is there to appease them. </li>
</ul>
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