In a Bash script, you can defer running a command by using trap like this:
touch /tmp/mytempfile
trap "rm -f /tmp/mytempfile" EXIT
# ... continue your script without a care in the world
trap "rm -f /tmp/mytempfile" EXIT
# ... continue your script without a care in the world
This will make sure your temp file is deleted when the script finishes running, even if there were errors.
You can also run a function (e.g. trap my_cleanup_function EXIT), or change EXIT to a signal like SIGINT.
Final thoughts
AI taught me this one. What a time to be alive.