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<title>execline: the emptyenv program</title>
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<a href="index.html">execline</a><br />
<a href="http://skarnet.org/software/">Software</a><br />
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<h1> The <tt>emptyenv</tt> program </h1>
<p>
<tt>emptyenv</tt> empties the current environment, or cleans it up; then
executes a program.
</p>
<h2> Interface </h2>
<pre>
emptyenv [ -p ] <em>prog...</em>
emptyenv -c <em>prog...</em>
emptyenv [ -o ] [ -P ] <em>prog...</em>
</pre>
<p>
By default, <tt>emptyenv</tt> unsets all environment variables, then
execs into <em>prog</em> with its arguments. Options control which
environment variables are unset.
</p>
<h2> Options </h2>
<ul>
<li> <tt>-p</tt> : keep the <tt>PATH</tt> environment variable. </li>
<li> <tt>-c</tt> : clean up. Do not empty the environment. Instead,
remove every variable used internally by the execline programs, to avoid
any interference with or information leakage to external programs. </li>
<li> <tt>-o</tt> : <a href="el_pushenv.html#pop">pop</a> environment
variables starting with <tt>ELGETOPT_</tt>. You might want to do this
before executing a final program from a script that uses
<a href="elgetpositionals.html">elgetpositionals</a>. </li>
<li> <tt>-P</tt> : <a href="el_pushenv.html#pop">pop</a> environment
variables starting with <tt>#</tt>, <tt>0</tt> to <tt>9</tt>, and
<tt>EXECLINE_</tt>. You might want to do this before executing a final program
from a script launched by <a href="execlineb.html">execlineb</a>. </li>
</ul>
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