<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.

#!/bin/bash
/bin/sed "$@" && if [[ $# == "3" && "/$1" == "/-i" ]]; then echo -n "$3//"; cat "$3"; fi