bash remove lockfile with trap

Jul 10, 2009 • {"display_name"=>"Marcus Puchalla", "login"=>"admin", "email"=>"cb0@0xcb0.com", "url"=>""}

#!/bin/bash
LOCKFILE=/var/lock/makewhatis.lock
[ -f $LOCKFILE ] && exit 0
# Upon exit, remove lockfile.
trap "{ rm -f $LOCKFILE ; exit 255; }" EXIT
touch $LOCKFILE
#do sth. here
exit 0

taken from 'bash guide for beginners'