# test the trap code trap 'echo exiting' 0 trap 'echo aborting' 1 2 3 6 15 # make sure a user-specified subshell runs the exit trap, but does not # inherit the exit trap from a parent shell ( trap 'echo subshell exit' 0; exit 0 ) ( exit 0 ) trap func() { trap 'echo [$LINENO] funcdebug' DEBUG echo funcdebug line } trap 'echo [$LINENO] debug' DEBUG echo debug line trap func trap trap '' DEBUG trap trap - debug trap trap - HUP trap hup trap '' INT trap '' int trap # hmmm...should this set the handling to SIG_IGN for children, too? trap '' USR2 ./trap1.sub # # show that setting a trap on SIGCHLD is not disastrous. # set -o monitor trap 'echo caught a child death' SIGCHLD sleep 7 & sleep 6 & sleep 5 & wait trap -p SIGCHLD # Now reset some of the signals the shell handles specially back to # their default values (with or without the SIG prefix) trap SIGINT QUIT TERM trap