man: systemctl: document effect of --all on journal output

Based on the journalctl documentation of this option added in 23ad99b519
(#10527), but with the first reference to “fields” replaced by “journal
messages”, since I think it’s less common to show other fields with
`systemctl status` (though it’s possible with the `-o` option).

diff --git a/man/systemctl.xml b/man/systemctl.xml
index b9077c55a1a8458ce4bf779e640c4d8ab52fd9c5..08aacd8f41c9ae7e9e7628ffd741d55ffc5aa768 100644 (file)
--- a/man/systemctl.xml
+++ b/man/systemctl.xml
@@ -136,6 +136,10 @@
           <para>When listing units with <command>list-dependencies</command>, recursively show
           dependencies of all dependent units (by default only dependencies of target units are
           shown).</para>
+
+          <para>When used with <command>status</command>, show journal messages 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>