Error Handling: trap and Exit Codes

Robust scripts clean up after themselves and signal failure with an exit code. trap runs a handler when the script exits; a non-zero exit code tells callers something went wrong.

Write /root/scripts/risky.sh that:

1. creates a scratch file /root/out/work.tmp,

2. registers a trap that removes /root/out/work.tmp on EXIT,

3. then fails on purpose, exiting with code 3.

Because the trap fires on the way out, work.tmp must NOT remain after the script runs — and the exit status must be 3. Grading runs your script, then checks both the exit code and that the scratch file was cleaned up.