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author | Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> | 2018-04-16 17:09:58 +0200 |
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committer | Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> | 2018-04-18 09:11:01 +0200 |
commit | 0f943ae4ea36148c0e2c4a69735410c8e48648d0 (patch) | |
tree | a1018f4cf1722ffe311731963fbd00190f14688e /man/systemd.syntax.xml | |
parent | 4298e26176c289841b8492cbd1f6a0f6c1f205fe (diff) | |
download | systemd-0f943ae4ea36148c0e2c4a69735410c8e48648d0.tar.gz |
man: add a new page with a general description of common syntax
We have a common parser, but for the user it might be
completely unobvious that the same general rules apply
to all those files. Let's add a page about the basic syntax
so that the more specific pages don't have to repeat those
details.
Diffstat (limited to 'man/systemd.syntax.xml')
-rw-r--r-- | man/systemd.syntax.xml | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/man/systemd.syntax.xml b/man/systemd.syntax.xml new file mode 100644 index 0000000000..bafe817a9b --- /dev/null +++ b/man/systemd.syntax.xml @@ -0,0 +1,107 @@ +<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" + "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [ +<!ENTITY % entities SYSTEM "custom-entities.ent" > +%entities; +]> + +<!-- SPDX-License-Identifier: LGPL-2.1+ --> + +<refentry id="systemd.syntax"> + + <refentryinfo> + <title>systemd.syntax</title> + <productname>systemd</productname> + + <authorgroup> + <author> + <contrib>A. U. Thor</contrib> + <firstname>Zbigniew</firstname> + <surname>Jędrzejewski-Szmek</surname> + <email>zbyszek@in.waw.pl</email> + </author> + </authorgroup> + </refentryinfo> + + <refmeta> + <refentrytitle>systemd.syntax</refentrytitle> + <manvolnum>7</manvolnum> + </refmeta> + + <refnamediv> + <refname>systemd.syntax</refname> + <refpurpose>General syntax of systemd configuration files</refpurpose> + </refnamediv> + + <refsect1> + <title>Introduction</title> + + <para>This page describes the basic principles of configuration files used by + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry> + and related programs for: + <itemizedlist> + <listitem><para>systemd unit files, see + <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.automount</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.swap</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.target</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.path</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.timer</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.scope</refentrytitle><manvolnum>5</manvolnum></citerefentry></para></listitem> + + <listitem><para>daemon config files, see + <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd-user.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>journal-remote.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>journal-upload.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd-sleep.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>timesyncd.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry> + </para></listitem> + </itemizedlist> + </para> + + <para>The syntax is inspired by + <ulink url="http://standards.freedesktop.org/desktop-entry-spec/latest/">XDG Desktop Entry Specification</ulink> + <filename>.desktop</filename> files, which are in turn inspired by Microsoft Windows + <filename>.ini</filename> files. + </para> + + <para>Each file is a plain text file divided into sections, with configuration entries in the + style <replaceable>key</replaceable>=<replaceable>value</replaceable>. + Empty lines and lines starting with <literal>#</literal> or <literal>;</literal> are + ignored, which may be used for commenting.</para> + + <para>Lines ending in a backslash are concatenated with the following line while reading and the + backslash is replaced by a space character. This may be used to wrap long lines. The limit on + line length is very large (currently 1 MB), but it is recommended to avoid such long lines and + use multiple directives, variable substitution, or other mechanism as appropriate for the given + file type.</para> + + <example><programlisting>[Section A] +KeyOne=value 1 +KeyTwo=value 2 + +# a comment + +[Section B] +Setting="something" "some thing" "…" +KeyTwo=value 2 \ + value 2 continued +</programlisting></example> + + <para>Various settings are allowed to be specified more than once, in which case the + interpretation depends on the setting. Often, multiple settings form a list, and setting to an + empty value "resets", which means that previous assignments are ignored. When this is allowed, + it is mentioned in the description of the setting. Note that using multiple assignments to the + same value makes the file incompatible with parsers for the XDG <filename>.desktop</filename> + file format.</para> + </refsect1> + +</refentry> |