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man/systemd.service: add example for char prefixes

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The prefixes can be specified for any part of the command. The docs imply this,
but it's not entirely obvious. Let's add an example.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2023-04-02 20:16:01 +02:00
parent 8202c01701
commit 4d7ae2557b
1 changed files with 12 additions and 1 deletions
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13
man/systemd.service.xml
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@ -1249,7 +1249,7 @@
<tbody>
<row>
<entry><literal>@</literal></entry>
<entry>If the executable path is prefixed with <literal>@</literal>, the second specified token will be passed as <literal>argv[0]</literal> to the executed process (instead of the actual filename), followed by the further arguments specified.</entry>
<entry>If the executable path is prefixed with <literal>@</literal>, the second specified token will be passed as <constant>argv[0]</constant> to the executed process (instead of the actual filename), followed by the further arguments specified.</entry>
</row>
<row>
@ -1364,6 +1364,17 @@ ExecStart=/bin/echo $ONE $TWO $THREE</programlisting>
<para>Example:</para>
<programlisting>Type=oneshot
ExecStart=:echo $USER ; -false ; +:@true $TEST</programlisting>
<para>This will execute <command>/usr/bin/echo</command> with the literal argument
<literal>$USER</literal> (<literal>:</literal> suppresses variable expansion), and then
<command>/usr/bin/false</command> (the return value will be ignored because <literal>-</literal>
suppresses checking of the return value), and <command>/usr/bin/true</command> (with elevated privileges,
with <literal>$TEST</literal> as <constant>argv[0]</constant>).</para>
<para>Example:</para>
<programlisting>ExecStart=echo / &gt;/dev/null &amp; \; \
ls</programlisting>