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Full Discussion: stdout/stderr to mail if error
Top Forums Shell Programming and Scripting stdout/stderr to mail if error Post 302480677 by niswonp on Wednesday 15th of December 2010 01:11:23 PM
Old 12-15-2010
stdout/stderr to mail if error
I have searched the forum and seems like I
just don't quite find my question.

I have a script that runs out of cron and I
am trying to send normal successful stdout
to /dev/null, but if there is an error, I
want both stdout/stderr to go to mail.

In other words, I only want to know about
it if there is a problem (error), then I want
to see both stdout/stderr.

If I understand correctly, the following sends both
stdout and stderr to /dev/null:

>/dev/null 2>&1

The following sends stdout and stderr to the same place,
mail in my case.

2>&1

I guess I don't understand enough to make this happen
or even if it's possible.

Any advice is appreciated.

Thanks.
 

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LEARN ABOUT DEBIAN

annotate-output

ANNOTATE-OUTPUT(1)					      General Commands Manual						ANNOTATE-OUTPUT(1)

NAME

       annotate-output - annotate program output with time and stream

SYNOPSIS

       annotate-output [options] program [args ...]

DESCRIPTION

       annotate-output will execute the specified program, while prepending every line with the current time and O for stdout and E for stderr.

OPTIONS

       +FORMAT
	      Controls the timestamp format, as per date(1).  Defaults to "%H:%M:%S".

       -h, --help
	      Display a help message and exit successfully.

EXAMPLE

       $ annotate-output make
       21:41:21 I: Started make
       21:41:21 O: gcc -Wall program.c
       21:43:18 E: program.c: Couldn't compile, and took me ages to find out
       21:43:19 E: collect2: ld returned 1 exit status
       21:43:19 E: make: *** [all] Error 1
       21:43:19 I: Finished with exitcode 2

BUGS

       Since  stdout  and  stderr  are	processed  in parallel, it can happen that some lines received on stdout will show up before later-printed
       stderr lines (and vice-versa).

       This is unfortunately very hard to fix with the current annotation strategy.  A fix would involve  switching  to  PTRACE'ing  the  process.
       Giving nice a (much) higher priority over the executed program could however cause this behaviour to show up less frequently.

       The program does not work as well when the output is not linewise.  In particular, when an interactive program asks for input, the question
       might not be shown until after you have answered it.  This will give the impression that the annotated program has hung, while it has not.

SEE ALSO

       date(1)

SUPPORT

       This program is community-supported (meaning: you'll need to fix it yourself).  Patches are however appreciated, as is any feedback  (posi-
       tive or negative).

AUTHOR

       annotate-output	was written by Jeroen van Wolffelaar <jeroen@wolffelaar.nl> This manpage comes under the same copyright as annotate-output
       itself, read /usr/bin/annotate-output (or wherever you install it) for the details.

DEBIAN
								 Debian Utilities						ANNOTATE-OUTPUT(1)
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