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Here's a start.
preexec() { lastcommand=$1 exec 3>&1 4>&2 exec 2> >(tee /tmp/output 1>&4) } precmd() { read line </tmp/output case "$line" in "Can't locate"*) echo "Perl module missing running $lastcommand" ;; esac }
But maybe you want to do something at the language level like How can I hook into Perl's use/require so I can throw an exception?