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systemctl: clarify that "status" is about the most recent invocation of a service

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And point people to "journalctl --unit=" for information of prior runs.

Inspired by: #24159

(cherry picked from commit 157cb4337b)
This commit is contained in:
Lennart Poettering 2022-08-02 17:27:29 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent d3e84e4703
commit 0cfe2d7e88
1 changed files with 17 additions and 18 deletions
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35
man/systemctl.xml
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@ -196,25 +196,24 @@ Sun 2017-02-26 20:57:49 EST 2h 3min left Sun 2017-02-26 11:56:36 EST 6h ago
<option>-t</option>). If a PID is passed, show information
about the unit the process belongs to.</para>
<para>This function is intended to generate human-readable
output. If you are looking for computer-parsable output,
use <command>show</command> instead. By default, this
function only shows 10 lines of output and ellipsizes
lines to fit in the terminal window. This can be changed
with <option>--lines</option> and <option>--full</option>,
see above. In addition, <command>journalctl
--unit=<replaceable>NAME</replaceable></command> or
<command>journalctl
--user-unit=<replaceable>NAME</replaceable></command> use
a similar filter for messages and might be more
convenient.
</para>
<para>This function is intended to generate human-readable output. If you are looking for
computer-parsable output, use <command>show</command> instead. By default, this function only
shows 10 lines of output and ellipsizes lines to fit in the terminal window. This can be changed
with <option>--lines</option> and <option>--full</option>, see above. In addition,
<command>journalctl --unit=<replaceable>NAME</replaceable></command> or <command>journalctl
--user-unit=<replaceable>NAME</replaceable></command> use a similar filter for messages and might
be more convenient.</para>
<para>systemd implicitly loads units as necessary, so just running the <command>status</command> will
attempt to load a file. The command is thus not useful for determining if something was already loaded or
not. The units may possibly also be quickly unloaded after the operation is completed if there's no reason
to keep it in memory thereafter.
</para>
<para>Note that this operation only displays <emph>runtime</emph> status, i.e. information about
the current invocation of the unit (if it is running) or the most recent invocation (if it is not
running anymore, and has not been released from memory). Information about earlier invocations,
invocations from previous system boots, or prior invocations that have already been released from
memory may be retrieved via <command>journalctl --unit=</command>.</para>
<para>systemd implicitly loads units as necessary, so just running the <command>status</command>
will attempt to load a file. The command is thus not useful for determining if something was
already loaded or not. The units may possibly also be quickly unloaded after the operation is
completed if there's no reason to keep it in memory thereafter.</para>
<example>
<title>Example output from systemctl status </title>