exit
exit 0 success signal
alias x="exit"
$?
set -e
return
trap
exit, set, exit 0, $?
signal: SIGINT, SIGTERM, SIGSEGV, SIGBUS, exit 0
set, unset, set -o, set -x, set -e, set +e, set -E, set +b, set -u, $?, exit, return, trap, PostgreSQL SET
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