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man: document "s" is default --vacuum-time= suffix

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Anatoli Babenia 2022-10-30 17:06:38 +03:00 committed by Lennart Poettering
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commit 5c193a7c3c
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37
man/journalctl.xml
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@ -742,22 +742,31 @@
<term><option>--vacuum-time=</option></term>
<term><option>--vacuum-files=</option></term>
<listitem><para>Removes the oldest archived journal files until the disk space they use falls below
the specified size (specified with the usual <literal>K</literal>, <literal>M</literal>,
<literal>G</literal> and <literal>T</literal> suffixes), or all archived journal files contain no
data older than the specified timespan (specified with the usual <literal>s</literal>,
<literal>m</literal>, <literal>h</literal>, <literal>days</literal>, <literal>months</literal>,
<literal>weeks</literal> and <literal>years</literal> suffixes), or no more than the specified
number of separate journal files remain. Note that running <option>--vacuum-size=</option> has only
an indirect effect on the output shown by <option>--disk-usage</option>, as the latter includes
active journal files, while the vacuuming operation only operates on archived journal
files. Similarly, <option>--vacuum-files=</option> might not actually reduce the number of journal
files to below the specified number, as it will not remove active journal files.</para>
<listitem><para><option>--vacuum-size=</option> removes the oldest archived journal files until the
disk space they use falls below the specified size. Accepts the usual <literal>K</literal>,
<literal>M</literal>, <literal>G</literal> and <literal>T</literal> suffixes (to the base of
1024).</para>
<para><option>--vacuum-time=</option> removes archived journal files older than the specified
timespan. Accepts the usual <literal>s</literal> (default), <literal>m</literal>,
<literal>h</literal>, <literal>days</literal>, <literal>months</literal>, <literal>weeks</literal>
and <literal>years</literal> suffixes, see
<citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry> for
details.</para>
<para><option>--vacuum-files=</option> leaves only the specified number of separate journal
files.</para>
<para>Note that running <option>--vacuum-size=</option> has only an indirect effect on the output
shown by <option>--disk-usage</option>, as the latter includes active journal files, while the
vacuuming operation only operates on archived journal files. Similarly,
<option>--vacuum-files=</option> might not actually reduce the number of journal files to below the
specified number, as it will not remove active journal files.</para>
<para><option>--vacuum-size=</option>, <option>--vacuum-time=</option> and
<option>--vacuum-files=</option> may be combined in a single invocation to enforce any combination
of a size, a time and a number of files limit on the archived journal files. Specifying any of
these three parameters as zero is equivalent to not enforcing the specific limit, and is thus
<option>--vacuum-files=</option> may be combined in a single invocation to enforce any combination of
a size, a time and a number of files limit on the archived journal files. Specifying any of these
three parameters as zero is equivalent to not enforcing the specific limit, and is thus
redundant.</para>
<para>These three switches may also be combined with <option>--rotate</option> into one command. If