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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>sysusers.d</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><style>
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</style><a href="index.html">Index </a>·
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<a href="../python-systemd/index.html">Python </a>·
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<a href="../libudev/index.html">gudev </a><span style="float:right">systemd 215</span><hr><div class="refentry"><a name="sysusers.d"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sysusers.d — Declarative allocation of system users and groups</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><p><code class="filename">/usr/lib/sysusers.d/*.conf</code></p></div><div class="refsect1"><a name="idm214170527280"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><span class="command"><strong>systemd-sysusers</strong></span> uses the
files from <code class="filename">/usr/lib/sysusers.d/</code>
to create system users and groups at package
installation or boot time. This tool may be used for
allocating system users and groups only, it is not
useful for creating non-system users and groups, as it
accessed <code class="filename">/etc/passwd</code> and
<code class="filename">/etc/group</code> directly, bypassing
any more complex user database, for example any
database involving NIS or LDAP.</p></div><div class="refsect1"><a name="idm214170523056"></a><h2 id="File Format">File Format<a class="headerlink" title="Permalink to this headline" href="#File%20Format">¶</a></h2><p>Each file shall be named in the style of
<code class="filename"><em class="replaceable"><code>package</code></em>.conf</code>.</p><p>All files are sorted by their filename in
lexicographic order, regardless of which of the
directories they reside in. If multiple files specify
the same user or group, the entry in the file with the
lexicographically earliest name will be applied, all
all other conflicting entries will be logged as
errors. Users and groups are
processed in the order they are listed.</p><p>The file format is one line per user or group
containing name, ID and GECOS field description:</p><pre class="programlisting"># Type Name ID GECOS
u httpd 440 "HTTP User"
u authd /usr/bin/authd "Authorization user"
g input - -
m authd input</pre><div class="refsect2"><a name="idm214170518848"></a><h3 id="Type">Type<a class="headerlink" title="Permalink to this headline" href="#Type">¶</a></h3><p>The type consists of a single
letter. The following line types are
understood:</p><div class="variablelist"><dl class="variablelist"><dt id="u"><span class="term"><code class="varname">u</code></span><a class="headerlink" title="Permalink to this term" href="#u">¶</a></dt><dd><p>Create a
system user and group of the
specified name should they not
exist yet. The user's primary
group will be set to the group
bearing the same name. The
user's shell will be set to
<code class="filename">/sbin/login</code>,
the home directory to
<code class="filename">/</code>. The
account will be created
disabled, so that logins are
not allowed.</p></dd><dt id="g"><span class="term"><code class="varname">g</code></span><a class="headerlink" title="Permalink to this term" href="#g">¶</a></dt><dd><p>Create a
system group of the specified
name should it not exist
yet. Note that
<code class="varname">u</code>
implicitly create a matching
group. The group will be
created with no password
set.</p></dd><dt id="m"><span class="term"><code class="varname">m</code></span><a class="headerlink" title="Permalink to this term" href="#m">¶</a></dt><dd><p>Add a user to
a group. If the user or group
are not existing yet, they
will be implicitly
created.</p></dd></dl></div></div><div class="refsect2"><a name="idm214174461584"></a><h3 id="Name">Name<a class="headerlink" title="Permalink to this headline" href="#Name">¶</a></h3><p>The name field specifies the user or
group name. It should be be shorter than 256
characters and avoid any non-ASCII characters,
and not begin with a numeric character. It is
strongly recommended to pick user and group
names that are unlikely to clash with normal
users created by the administrator. A good
scheme to guarantee this is by prefixing all
system and group names with the underscore,
and avoiding too generic names.</p><p>For <code class="varname">m</code> lines this
field should contain the user name to add to a
group.</p></div><div class="refsect2"><a name="idm214174458848"></a><h3 id="ID">ID<a class="headerlink" title="Permalink to this headline" href="#ID">¶</a></h3><p>For <code class="varname">u</code> and
<code class="varname">g</code> the numeric 32bit UID or
GID of the user/group. Do not use IDs 65535 or
4294967295, as they have special placeholder
meanings. Specify "-" for automatic UID/GID
allocation for the user or
group. Alternatively, specify an absolute path
in the file system. In this case the UID/GID
is read from the path's owner/group. This is
useful to create users whose UID/GID match the
owners of pre-existing files (such as SUID or
SGID binaries).</p><p>For <code class="varname">m</code> lines this
field should contain the group name to add to
a user to.</p></div><div class="refsect2"><a name="idm214174454560"></a><h3 id="GECOS">GECOS<a class="headerlink" title="Permalink to this headline" href="#GECOS">¶</a></h3><p>A short, descriptive string for users to
be created, enclosed in quotation marks. Note
that this field may not contain colons.</p><p>Only applies to lines of type
<code class="varname">u</code> and should otherwise be
left unset.</p></div></div><div class="refsect1"><a name="idm214174452288"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
<a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
<a href="systemd-sysusers.html"><span class="citerefentry"><span class="refentrytitle">systemd-sysusers</span>(8)</span></a>
</p></div></div></body></html>
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