[systemd-devel] [PATCH] journalctl: add --iso-dates for long timestamps

Thomas Bächler thomas at archlinux.org
Thu Jul 18 01:45:30 PDT 2013

Am 17.07.2013 17:58, schrieb Zbigniew Jędrzejewski-Szmek:
> So, now we have -o short, -o short-monotonic, and --iso-dates.
> I'm sure we'll add a relative timestamp mode like the excellent one in
> dmesg --human output in recent util-linux. So I'd say that it makes
> sense to deprecate short-monotonic and add a new switch --timestamps,
> --timestamps=monotonic → old short-monotonic
> --timestamps=iso-date → what you're proposing
> --timestamps=...
> This makes the whole thing easier to grok, imo. Journalctl already has
> 1½ page listing of options...

The output options of journalctl have bugged me for some time now. There
are many options, but the usefulness of many of those is questionable.
At the same time, the choice of output modes lacks flexibility - this is
certainly not the last time that someone will come up with a new way to
format output and submit a patch for it to journalctl.

In my opinion, journalctl (and the journal API) should get an output
option that accepts a printf-like format string. With such a format
string, we would finally get all the flexibility with a simple and
well-understood syntax.

In addition to the standard journal fields, format strings could
reference non-standard fields using a syntax similar to udev's
'%env{FOOBAR}'. We could be able limit the length of the output similar
to what is done in printf. We could have (to get back on topic)
different format modifiers for different date formats (ISO,
human-readable, epoch, ...).

Just my 2 cents.

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