will be printed. This is available in systemd services. See
<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
+
+ <para>With <command>show</command>, well-known UUIDs are printed. When no arguments are specified, all
+ known UUIDs are shown. When arguments are specified, they must be the names or values of one or more
+ known UUIDs, which are then printed.</para>
</refsect1>
<refsect1>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><option>-u</option></term>
+ <term><option>--uuid</option></term>
+
+ <listitem><para>Generate output as an UUID formatted in the "canonical representation", with five
+ groups of digits separated by hyphens. See the
+ <ulink url="https://en.wikipedia.org/wiki/Universally_unique_identifier#Format">wikipedia</ulink>
+ for more discussion.</para></listitem>
+ </varlistentry>
+
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />
</variablelist>