<para>When outputting to a tty, lines are colored according to
priority: lines of level ERROR and higher are colored red; lines
- of level NOTICE and higher are highlighted; other lines are
- displayed normally.</para>
+ of level NOTICE and higher are highlighted; lines of level DEBUG
+ are colored lighter grey; other lines are displayed normally.</para>
</refsect1>
<refsect1>
<term><option>-a</option></term>
<term><option>--all</option></term>
- <listitem><para>Show all fields in full, even if they
- include unprintable characters or are very
- long.</para></listitem>
+ <listitem><para>Show all fields in full, even if they include unprintable characters or are very long. By
+ default, fields with unprintable characters are abbreviated as "blob data". (Note that the pager may escape
+ unprintable characters again.)</para></listitem>
</varlistentry>
<varlistentry>
<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. <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
- redundant.</para></listitem>
+ <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>
+
+ <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 redundant.</para>
+
+ <para>These three switches may also be combined with <option>--rotate</option> into one command. If so, all
+ active files are rotated first, and the requested vacuuming operation is executed right after. The rotation has
+ the effect that all currently active files are archived (and potentially new, empty journal files opened as
+ replacement), and hence the vacuuming operation has the greatest effect as it can take all log data written so
+ far into account.</para></listitem>
</varlistentry>
<varlistentry>
<varlistentry>
<term><option>--rotate</option></term>
- <listitem><para>Asks the journal daemon to rotate journal
- files. This call does not return until the rotation operation
- is complete.</para></listitem>
+ <listitem><para>Asks the journal daemon to rotate journal files. This call does not return until the rotation
+ operation is complete. Journal file rotation has the effect that all currently active journal files are marked
+ as archived and renamed, so that they are never written to in future. New (empty) journal files are then
+ created in their place. This operation may be combined with <option>--vacuum-size=</option>,
+ <option>--vacuum-time=</option> and <option>--vacuum-file=</option> into a single command, see
+ above.</para></listitem>
</varlistentry>
<xi:include href="standard-options.xml" xpointer="help" />
projects / thirdparty / systemd.git / blobdiff