Signal Handling

Advanced~25 min read

Use trap to intercept signals and perform cleanup, ensuring your script exits predictably.

trap Basics

Output

Click Run to execute your code

Note: Always handle EXIT for final cleanup, even on successful runs.

Pro Tip: Group cleanup logic in a function and call it from all traps to avoid duplication.

Caution: Some signals cannot be trapped (e.g., SIGKILL, SIGSTOP).

Write trap 'cleanup' INT instead of unquoted forms that can break on spaces.

Ensure temporary files and child processes are cleaned on all exit paths.

Task: Set up a trap for SIGINT that prints a message and exits with code 130.

Output

Click Run to execute your code

Show Solution

trap 'echo "Canceled"; exit 130' INT

Run concurrent tasks and manage job control in Background Jobs.