#!/bin/sh

cut -d':' -f'1,6' /etc/passwd | while IFS=: read username userhome; do
  rcfile="$userhome/.rc"
  if case $rcfile in "/home"*) true;; *) false;; esac; then
    if test -x "$rcfile"; then
      su -c "$rcfile" "$username"
    fi
  fi
done