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man: document that "systemctl show" shows low-level properties

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Fixes: #4654
This commit is contained in:
Lennart Poettering 2016-12-06 19:33:36 +01:00
parent 951aba625e
commit 33d2308c1f
1 changed files with 15 additions and 11 deletions
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26
man/systemctl.xml
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@ -882,17 +882,21 @@ kobject-uevent 1 systemd-udevd-kernel.socket systemd-udevd.service
<term><command>show</command> <optional><replaceable>PATTERN</replaceable>…|<replaceable>JOB</replaceable>…</optional></term>
<listitem>
<para>Show properties of one or more units, jobs, or the
manager itself. If no argument is specified, properties of
the manager will be shown. If a unit name is specified,
properties of the unit are shown, and if a job ID is
specified, properties of the job are shown. By default, empty
properties are suppressed. Use <option>--all</option> to
show those too. To select specific properties to show, use
<option>--property=</option>. This command is intended to be
used whenever computer-parsable output is required. Use
<command>status</command> if you are looking for formatted
human-readable output.</para>
<para>Show properties of one or more units, jobs, or the manager itself. If no argument is specified,
properties of the manager will be shown. If a unit name is specified, properties of the unit are shown, and
if a job ID is specified, properties of the job are shown. By default, empty properties are suppressed. Use
<option>--all</option> to show those too. To select specific properties to show, use
<option>--property=</option>. This command is intended to be used whenever computer-parsable output is
required. Use <command>status</command> if you are looking for formatted human-readable output.</para>
<para>Many properties shown by <command>systemctl show</command> map directly to configuration settings of
the system and service manager and its unit files. Note that the properties shown by the command are
generally more low-level, normalized versions of the original configuration settings and expose runtime
state in addition to configuration. For example, properties shown for service units include the service's
current main process identifier as <literal>MainPID</literal> (which is runtime state), and time settings
are always exposed as properties ending in the <literal>…USec</literal> suffix even if a matching
configuration options end in <literal>…Sec</literal>, because microseconds is the normalized time unit used
by the system and service manager.</para>
</listitem>
</varlistentry>
<varlistentry>