tldr/pages/linux/trap.md

trap

Automatically execute commands after receiving signals by processes or the operating system. Can be used to perform cleanups for interruptions by the user or other actions.

• List available signals to set traps for:

trap -l

• List active traps for the current shell:

trap -p

• Set a trap to execute commands when one or more signals are detected:

trap 'echo "Caught signal SIGHUP"' SIGHUP

• Remove active traps:

trap - SIGHUP SIGINT

• Set a trap to delete a file after the user has interrupted a download:

trap 'rm -i master.zip' SIGINT ERR