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<title>s6: the s6-applyuidgid program</title>
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<meta name="Keywords" content="s6 command s6-applyuidgid uid gid groups privilege dropping loss user change su" />
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<h1> The s6-applyuidgid program </h1>
<p>
s6-applyuidgid executes a program with reduced privileges.
</p>
<h2> Interface </h2>
<pre>
s6-applyuidgid [ -z ] [ -u <em>uid</em> ] [ -g <em>gid</em> ] [ -G <em>gidlist</em> ] [ -U ] <em>prog...</em>
</pre>
<ul>
<li> s6-applyuidgid sets its uid, gid and supplementary group list to the
values given, then executes into <em>prog</em>. </li>
</ul>
<h2> Options </h2>
<ul>
<li> <tt>-u <em>uid</em></tt> : set the process' user ID to <em>uid</em> </li>
<li> <tt>-g <em>gid</em></tt> : set the process' group ID to <em>gid</em> </li>
<li> <tt>-G <em>gidlist</em></tt> : set the process' supplementary group list
to <em>gidlist</em>, which must be given as a comma-separated list of numeric GIDs,
without spaces. </li>
<li> <tt>-U</tt> : set the process' user ID, group ID and supplementary group list
to the values of the UID, GID and GIDLIST environment variables. If a <tt>-u</tt>,
<tt>-g</tt> or <tt>-G</tt> option is given after <tt>-U</tt>, the command line
value overrides the environment variable. </li>
<li> <tt>-z</tt> : unexport. The UID, GID and GIDLIST variables will be
removed from the process environment. </li>
</ul>
<h2> Notes </h2>
<ul>
<li> s6-applyuidgid can only be run as root. Its main use is to drop root privileges before
starting a daemon. </li>
<li> s6-applyuidgid is a more generic version of
<a href="s6-setuidgid.html">s6-setuidgid</a>. It is used as a command line
building block by some programs that rewrite their command line, such as
<a href="//skarnet.org/software/s6-networking/s6-tcpserver.html">s6-tcpserver</a>. </li>
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