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Is there a way to display errors summary (from stderr) after an application has finished?

E.g. rsync with "--progress" displays LOTS of data, including errors. But when it finishes - it just says "there were errors". I want to display everything that was written to stderr in that case, so i don't have to scroll and search what precisely went wrong :)

P.S. I know how simple it is to write such utility in C, but i guess there can be more handy things i'm not aware of :)

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up vote 4 down vote accepted

A wrapper script to handle this:



"$@" 2>$TMPFILE

if [ "$?" != "0" ]; then
  cat $TMPFILE

If you save this to /usr/local/bin/delaystderr and chmod +x /usr/local/bin/delaystderr, you should be able to run as delaystderr rsync --progress. If the process exits without signalling error (returning non-zero), stderr won't be printed; you can delete the lines starting with if and fi to disable that behaviour if you like.

I'm not sure how you'd get any easier than that.

(Note: I haven't actually tested this script, so buyer beware and all that)

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Similar to womble's answer, you can write a bash script something like:


set -e


exec 2>$TMPFILE
trap 'cat "$TMPFILE"; rm -f "$TMPFILE" exit $?' INT TERM EXIT


and this should save everything sent to stderr for the entire script and output it at the end. As with womble's answer, I've not tested this.

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I don't know how many errors Gary is getting but if it's a lot then "easier" might mean that cat should be replaced by more or less. – Dennis Williamson Jul 25 '09 at 4:17
less in a script is annoying. If you want to page the output, pipe the script into less. It's more flexible that way. – David Pashley Jul 25 '09 at 5:21

If you're using bash redirect stderr to stdout then, optionally, redirect that to a file:

rsync --progress 2>&1
rsync --progress 2>&1 > file.out
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That's true, thanks, but i'd like to find something that does the job easier :) – kolypto Jul 25 '09 at 2:36

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