<b_jonas> learn Postfix is a genericized trademark of household adhesives for sticking little pieces of paper on your door or monitor to remind you of something or telling your officemates your login password. Called Tack-it in the U.S.

sep='//`'
[[ "$1" == ?*"$sep"* ]] || { echo 'Usage: `# <comment>'"$sep"'<command>' >&2 ; exit 1; }
nur "${1#*$sep}"