+ <para>The following specifiers are interpreted in the
+ Install section: %n, %N, %p, %i, %U, %u, %m, %H, %b, %v.
+ For their meaning see the next section.
+ </para>
+ </refsect1>
+
+ <refsect1>
+ <title>Specifiers</title>
+
+ <para>Many settings resolve specifiers which may be
+ used to write generic unit files referring to runtime
+ or unit parameters that are replaced when the unit
+ files are loaded. The following specifiers are
+ understood:</para>
+
+ <table>
+ <title>Specifiers available in unit files</title>
+ <tgroup cols='3' align='left' colsep='1' rowsep='1'>
+ <colspec colname="spec" />
+ <colspec colname="mean" />
+ <colspec colname="detail" />
+ <thead>
+ <row>
+ <entry>Specifier</entry>
+ <entry>Meaning</entry>
+ <entry>Details</entry>
+ </row>
+ </thead>
+ <tbody>
+ <row>
+ <entry><literal>%n</literal></entry>
+ <entry>Full unit name</entry>
+ <entry></entry>
+ </row>
+ <row>
+ <entry><literal>%N</literal></entry>
+ <entry>Unescaped full unit name</entry>
+ <entry>Same as <literal>%n</literal>, but with escaping undone</entry>
+ </row>
+ <row>
+ <entry><literal>%p</literal></entry>
+ <entry>Prefix name</entry>
+ <entry>For instantiated units, this refers to the string before the <literal>@</literal> character of the unit name. For non-instantiated units, this refers to the name of the unit with the type suffix removed.</entry>
+ </row>
+ <row>
+ <entry><literal>%P</literal></entry>
+ <entry>Unescaped prefix name</entry>
+ <entry>Same as <literal>%p</literal>, but with escaping undone</entry>
+ </row>
+ <row>
+ <entry><literal>%i</literal></entry>
+ <entry>Instance name</entry>
+ <entry>For instantiated units: this is the string between the <literal>@</literal> character and the suffix of the unit name.</entry>
+ </row>
+ <row>
+ <entry><literal>%I</literal></entry>
+ <entry>Unescaped instance name</entry>
+ <entry>Same as <literal>%i</literal>, but with escaping undone</entry>
+ </row>
+ <row>
+ <entry><literal>%f</literal></entry>
+ <entry>Unescaped filename</entry>
+ <entry>This is either the unescaped instance name (if applicable) with <filename>/</filename> prepended (if applicable), or the prefix name prepended with <filename>/</filename>.</entry>
+ </row>
+ <row>
+ <entry><literal>%c</literal></entry>
+ <entry>Control group path of the unit</entry>
+ <entry>This path does not include the <filename>/sys/fs/cgroup/systemd/</filename> prefix.</entry>
+ </row>
+ <row>
+ <entry><literal>%r</literal></entry>
+ <entry>Control group path of the slice the unit is placed in</entry>
+ <entry>This usually maps to the parent cgroup path of <literal>%c</literal>.</entry>
+ </row>
+ <row>
+ <entry><literal>%R</literal></entry>
+ <entry>Root control group path below which slices and units are placed</entry>
+ <entry>For system instances, this resolves to <filename>/</filename>, except in containers, where this maps to the container's root control group path.</entry>
+ </row>
+ <row>
+ <entry><literal>%t</literal></entry>
+ <entry>Runtime directory</entry>
+ <entry>This is either <filename>/run</filename> (for the system manager) or the path <literal>$XDG_RUNTIME_DIR</literal> resolves to (for user managers).</entry>
+ </row>
+ <row>
+ <entry><literal>%u</literal></entry>
+ <entry>User name</entry>
+ <entry>This is the name of the configured user of the unit, or (if none is set) the user running the systemd instance.</entry>
+ </row>
+ <row>
+ <entry><literal>%U</literal></entry>
+ <entry>User UID</entry>
+ <entry>This is the numeric UID of the configured user of the unit, or (if none is set) the user running the systemd user instance. Note that this specifier is not available for units run by the systemd system instance (as opposed to those run by a systemd user instance), unless the user has been configured as a numeric UID in the first place or the configured user is the root user.</entry>
+ </row>
+ <row>
+ <entry><literal>%h</literal></entry>
+ <entry>User home directory</entry>
+ <entry>This is the home directory of the configured user of the unit, or (if none is set) the user running the systemd user instance. Similar to <literal>%U</literal>, this specifier is not available for units run by the systemd system instance, unless the configured user is the root user.</entry>
+ </row>
+ <row>
+ <entry><literal>%s</literal></entry>
+ <entry>User shell</entry>
+ <entry>This is the shell of the configured user of the unit, or (if none is set) the user running the systemd user instance. Similar to <literal>%U</literal>, this specifier is not available for units run by the systemd system instance, unless the configured user is the root user.</entry>
+ </row>
+ <row>
+ <entry><literal>%m</literal></entry>
+ <entry>Machine ID</entry>
+ <entry>The machine ID of the running system, formatted as string. See <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry> for more information.</entry>
+ </row>
+ <row>
+ <entry><literal>%b</literal></entry>
+ <entry>Boot ID</entry>
+ <entry>The boot ID of the running system, formatted as string. See <citerefentry><refentrytitle>random</refentrytitle><manvolnum>4</manvolnum></citerefentry> for more information.</entry>
+ </row>
+ <row>
+ <entry><literal>%H</literal></entry>
+ <entry>Host name</entry>
+ <entry>The hostname of the running system at the point in time the unit configuation is loaded.</entry>
+ </row>
+ <row>
+ <entry><literal>%v</literal></entry>
+ <entry>Kernel release</entry>
+ <entry>Identical to <command>uname -r</command> output</entry>
+ </row>
+ <row>
+ <entry><literal>%%</literal></entry>
+ <entry>Single percent sign</entry>
+ <entry>Use <literal>%%</literal> in place of <literal>%</literal> to specify a single percent sign.</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>