execute command as a defiend user with X forwarding

xsu.sh

#!/bin/sh
#
# execute command as a defiend user with X forwarding
# Example:
#   xsu auser gedit /some/text/file
#

if [ $# -lt 2 ]
then
  echo "Usage: xsu <user> <command> [args....]"
  exit 1
fi

NEW_USER=$1

# drop firs argument
shift

AUTH_FILE=/tmp/xauthexport.$$

xauth list | cut -d ' ' -f1 | xargs -r xauth extract ${AUTH_FILE}
chown ${NEW_USER} ${AUTH_FILE}

su ${NEW_USER} -c "xauth -i merge ${AUTH_FILE}; $*"

rm ${AUTH_FILE}