How can I use the trap command in shell scripts?

How can I use the trap command in shell scripts?

The trap command in shell scripts allows you to specify commands to be executed when the shell receives certain signals. For example, you can use it to clean up temporary files when a script is interrupted.

Can you give me an example of how to use it?

Sure! Here's a simple example:

#!/bin/bash

trap 'echo "Script interrupted! Cleaning up..."; rm -f temp_file' SIGINT

echo "Running script..."
sleep 10

echo "Script completed."

In this script, if you press Ctrl+C, it will execute the cleanup command.

What other signals can I trap?

You can trap various signals like SIGTERM, SIGHUP, SIGQUIT, and more. Each signal corresponds to different events, such as termination requests or hangups.

Is it possible to trap multiple signals at once?

Yes, you can trap multiple signals by specifying them in a single trap command. For example:

trap 'echo "Exiting..."; exit' SIGINT SIGTERM

This will execute the same command for both SIGINT and SIGTERM.