# make sure subshells at the end of pipelines run any exit traps they set : | { trap 'echo exit subshell 1' EXIT; exit; }; echo current shell : | { trap 'echo exit subshell 2' EXIT; exit; }; echo current shell : | { trap 'echo exit subshell 3' EXIT; exit; } | : ; echo current shell : | { trap 'echo exit subshell 4' EXIT; exit; } | : ; echo current shell trap 'echo inherited exit trap' EXIT : | { exit; } ; echo outside 1 : | ( exit; ) ; echo outside 2 : | { exit; } | : ; echo outside 3 : | ( exit; ) | : ; echo outside 4 trap - EXIT # make sure group commands that are not at the beginning or end of pipelines # run an EXIT trap, with and without the exit builtin echo ignored | { trap 'echo "in trap EXIT">&2' EXIT sleep 4 & echo 'sleep 2'>&2 sleep 2 echo 'wait $!'>&2 wait $! echo 'exit'>&2 exit } | cat echo ignored | { trap 'echo "in trap EXIT">&2' EXIT sleep 4 & echo 'sleep 2'>&2 sleep 2 echo 'wait $!'>&2 wait $! echo 'exit'>&2 } | cat