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<?xml version='1.0'?> <!--*-nxml-*-->
<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->
<refentry id="os-release">
<refentryinfo>
<title>os-release</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>Developer</contrib>
<firstname>Lennart</firstname>
<surname>Poettering</surname>
<email>lennart@poettering.net</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>os-release</refentrytitle>
<manvolnum>5</manvolnum>
</refmeta>
<refnamediv>
<refname>os-release</refname>
<refpurpose>Operating system identification</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>/etc/os-release</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>The <filename>/etc/os-release</filename> file
contains operating system identification data.</para>
<para>The basic file format of
<filename>os-release</filename> is a
newline-separated list of environment-like
shell-compatible variable assignments. It is possible
to source the configuration from shell scripts,
however, beyond mere variable assignments no shell
features are supported, allowing applications to read
the file without implementing a shell compatible
execution engine.</para>
<para><filename>/etc/os-release</filename> contains
data that is defined by the operating system vendor
and should not be changed by the administrator.</para>
<para>Depending on the operating system other
configuration files might be checked for OS
identification as well, however only as
fallback.</para>
</refsect1>
<refsect1>
<title>Options</title>
<para>The following OS identifications parameters may be set using
<filename>/etc/os-release</filename>:</para>
<variablelist>
<varlistentry>
<term><varname>NAME=</varname></term>
<listitem><para>A string identifying
the operating system, without a
version string, and not necessarily
suitable for presentation to the
user. If not set defaults to
<literal>Linux</literal>. Example:
<literal>NAME=Fedora</literal> or
<literal>NAME="Debian
GNU/Linux"</literal>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>VERSION=</varname></term>
<listitem><para>A string identifying
the operating system version,
excluding any name information and
suitable for presentation to the
user. Example:
<literal>VERSION=15</literal> or
<literal>VERSION="15
(Rawhide)"</literal>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>ID=</varname></term>
<listitem><para>A lower-case string
(no spaces) identifying the operating
system, excluding any version
information and suitable for
processing by scripts or usage in
generated file names. If not set
defaults to
<literal>linux</literal>. Example:
<literal>ID=fedora</literal>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>VERSION_ID=</varname></term>
<listitem><para>A lower-case string
(mostly numeric, no spaces) identifying the
operating system version, excluding
any name information and suitable for
processing by scripts or usage in generated file names. Example:
<literal>VERSION_ID=15</literal>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>PRETTY_NAME=</varname></term>
<listitem><para>A pretty operating
system name in a format suitable for
presentation to the user. May or may
not contain an OS version of some
kind, as suitable. If not set defaults
to <literal>Linux</literal>. Example:
<literal>PRETTY_NAME=Fedora 15
(Rawhide)</literal>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>ANSI_COLOR=</varname></term>
<listitem><para>A suggested
presentation color when showing the
distribution name on the console. This
should be specified as string suitable
for inclusion in the ESC [ m
ANSI/ECMA-48 escape code for setting
graphical rendition. Example:
<literal>ANSI_COLOR=0;31</literal> for
red, or
<literal>ANSI_COLOR=1;34</literal> for
light blue.</para></listitem>
</varlistentry>
</variablelist>
<para>If you are reading this file from code or a
shell script to determine the OS or a specific version
of it, use the ID and VERSION_ID fields. When looking
for an OS identification string for presentation to
the user use the PRETTY_NAME field.</para>
<para>Note that operating system vendors may choose
not to provide version information, for example to
accommodate for rolling releases. In this case VERSION
and VERSION_ID may be unset. Applications should not
rely on these fields to be set.</para>
</refsect1>
<refsect1>
<title>Example</title>
<programlisting>NAME=Fedora
VERSION="15 (Rawhide)"
ID=fedora
VERSION_ID=15
PRETTY_NAME="Fedora 15 (Rawhide)"
ANSI_COLOR=0;34</programlisting>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>lsb_release</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>hostname</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>machine-info</refentrytitle><manvolnum>5</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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