From: wgreenhouse-sGOZH3hwPm2sTnJN9+BGXg@public.gmane.org (W. Greenhouse)
To: info-gnus-english-mXXj517/zsQ@public.gmane.org
Subject: Re: gnus-agent-fetch in batch mode in a cron job
Date: Fri, 22 Feb 2013 06:32:12 +0000 [thread overview]
Message-ID: <87621koo43.fsf@riseup.net> (raw)
In-Reply-To: <87r4k8lvyr.fsf@free.fr>
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Hi Julien,
Julien Cubizolles <j.cubizolles-GANU6spQydw@public.gmane.org> writes:
> From what I understand Emacs outputs the whole *Messages* buffer to
> stdout. So there is nothing the shell can do to sort error messages from
> information messages. Is that right ?
Hrm, you're not quite correct, but I'm not sure it actually matters.
From (info "(emacs) Initial Options"):
> `-batch'
> `--batch'
> Run Emacs in "batch mode". Batch mode is used for running
> programs written in Emacs Lisp from shell scripts, makefiles, and
> so on. To invoke a Lisp program, use the `-batch' option in
> conjunction with one or more of `-l', `-f' or `--eval' (*note
> Action Arguments::). *Note Command Example::, for an example.
> In batch mode, Emacs does not display the text being edited, and
> the standard terminal interrupt characters such as `C-z' and `C-c'
> have their usual effect. Emacs functions that normally print a
> message in the echo area will print to either the standard output
> stream (`stdout') or the standard error stream (`stderr') instead.
> (To be precise, functions like `prin1', `princ' and `print' print
> to `stdout', while `message' and `error' print to `stderr'.)
> Functions that normally read keyboard input from the minibuffer
> take their input from the terminal's standard input stream
> (`stdin') instead.
etc.
So which file descriptor emacs --batch sends printed output to does
actually depend on the function being called. And looking at the source
of gnus-agent, it does look like functions like `signal' and `error' are
consistently used as they should be, for actual network errors--which is
good. However, `message' is also used frequently, e.g. for the
"Checking new news..." in `gnus-group-check-new-news.' So it's not
guaranteed that stderr will only contain errors. So, you might actually
be better off either redirecting all output to /dev/null (as the example
in (info "(gnus) Batching Agents") does), or else redirect to a log
file.
--
Regards,
WGG
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next prev parent reply other threads:[~2013-02-22 6:32 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-13 22:08 Julien Cubizolles
2013-02-20 16:39 ` W. Greenhouse
2013-02-22 6:10 ` Julien Cubizolles
2013-02-22 6:32 ` W. Greenhouse [this message]
[not found] ` <mailman.20575.1361513992.855.info-gnus-english@gnu.org>
2013-08-01 12:48 ` Lars Magne Ingebrigtsen
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