journalctl: add new output mode "short-full" (#3880)

This new output mode formats all timestamps using the usual format_timestamp()
call we use pretty much everywhere else. Timestamps formatted this way are some
ways more useful than traditional syslog timestamps as they include weekday,
month and timezone information, while not being much longer. They are also not
locale-dependent. The primary advantage however is that they may be passed
directly to journalctl's --since= and --until= switches as soon as #3869 is
merged.

While we are at it, let's also add "short-unix" to shell completion.

1 files changed, 23 insertions, 18 deletions

diff --git a/man/journalctl.xml b/man/journalctl.xml
index e77621d7b3..c448a29a51 100644
--- a/man/journalctl.xml
+++ b/man/journalctl.xml
@@ -250,6 +250,18 @@
 
             <varlistentry>
               <term>
+                <option>short-full</option>
+              </term>
+              <listitem>
+                <para>is very similar, but shows timestamps in the format the <option>--since=</option> and
+                <option>--until=</option> options accept. Unlike the timestamp information shown in
+                <option>short</option> output mode this mode includes weekday, year and timezone information in the
+                output, and is locale-independent.</para>
+              </listitem>
+            </varlistentry>
+
+            <varlistentry>
+              <term>
                 <option>short-iso</option>
               </term>
               <listitem>
@@ -572,24 +584,17 @@
         <term><option>-U</option></term>
         <term><option>--until=</option></term>
 
-        <listitem><para>Start showing entries on or newer than the
-        specified date, or on or older than the specified date,
-        respectively. Date specifications should be of the format
-        <literal>2012-10-30 18:17:16</literal>.  If the time part is
-        omitted, <literal>00:00:00</literal> is assumed.  If only the
-        seconds component is omitted, <literal>:00</literal> is
-        assumed. If the date component is omitted, the current day is
-        assumed. Alternatively the strings
-        <literal>yesterday</literal>, <literal>today</literal>,
-        <literal>tomorrow</literal> are understood, which refer to
-        00:00:00 of the day before the current day, the current day,
-        or the day after the current day,
-        respectively. <literal>now</literal> refers to the current
-        time. Finally, relative times may be specified, prefixed with
-        <literal>-</literal> or <literal>+</literal>, referring to
-        times before or after the current time, respectively. For complete
-        time and date specification, see
-        <citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>.
+        <listitem><para>Start showing entries on or newer than the specified date, or on or older than the specified
+        date, respectively. Date specifications should be of the format <literal>2012-10-30 18:17:16</literal>.  If the
+        time part is omitted, <literal>00:00:00</literal> is assumed.  If only the seconds component is omitted,
+        <literal>:00</literal> is assumed. If the date component is omitted, the current day is assumed. Alternatively
+        the strings <literal>yesterday</literal>, <literal>today</literal>, <literal>tomorrow</literal> are understood,
+        which refer to 00:00:00 of the day before the current day, the current day, or the day after the current day,
+        respectively. <literal>now</literal> refers to the current time. Finally, relative times may be specified,
+        prefixed with <literal>-</literal> or <literal>+</literal>, referring to times before or after the current
+        time, respectively. For complete time and date specification, see
+        <citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>. Note that
+        <option>--output=short-full</option> prints timestamps that follow precisely this format.
         </para>
         </listitem>
       </varlistentry>