Extremely useful in scripting. For a full listing of signals, use `kill -l`. Here's a sample script:

```bash
#!/bin/bash
# Sample script to test the trap command

# Catch and report errors
error_keyboard_interrupt() {
      echo -e "Caught SIGINT; logging and exiting"
      TEMPLOG=$(mktemp XXXXXX)

      echo -e "$1 Caught keyboard interrupt!" > $TEMPLOG
      mail -s "Severe" user@eng.uiowa.edu < $TEMPLOG

      rm -f $TEMPLOG
      exit
}

TESTPARAM="Oh noes!"
trap $(error_keyboard_interrupt $TESTPARAM) SIGINT

while :  # Same as while true
do
      sleep 60
      echo -e "Still alive..."
done
```