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Thanks chella, but your example only warns when you expect an error. My point was that an unsuspected "unbound variable" could get unnoticed.

radoulov, that works. I got a bit confused by the...

Thanks for your answer, radoulov, but I'm not sure that's the solution, because the trap doesn't catch within the pipe, only when the script ends:

my script is called "b":
trap "echo I\'m out..."...

Hi,
haven't found anything about this through searching, so may be a new topic:
when doing this:

set -o nounset
set -o errexit
find . -name "*.lib" | while read library; do
echo ${libary}...