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man: beef up $MAINPID examples
Inspired by https://github.com/systemd/systemd/pull/15400#discussion_r428537955.
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@ -464,7 +464,7 @@
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of the daemon, and may be used for command lines like the
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following:</para>
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<programlisting>/bin/kill -HUP $MAINPID</programlisting>
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<programlisting>ExecReload=kill -HUP $MAINPID</programlisting>
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<para>Note however that reloading a daemon by sending a signal
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(as with the example line above) is usually not a good choice,
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@ -473,7 +473,14 @@
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other. It is strongly recommended to set
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<varname>ExecReload=</varname> to a command that not only
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triggers a configuration reload of the daemon, but also
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synchronously waits for it to complete.</para>
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synchronously waits for it to complete. For example,
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<citerefentry project='mankier'><refentrytitle>dbus-broker</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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uses the following:</para>
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<programlisting>ExecReload=busctl call org.freedesktop.DBus \
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/org/freedesktop/DBus org.freedesktop.DBus \
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ReloadConfig
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</programlisting>
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</listitem>
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</varlistentry>
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