#! /bin/sh -e

case $#,$1 in
  0,* | 1,*) ok=nil ;;
  *,*:*) ok=t ;;
  *) ok=nil ;;
esac
case $ok in
  nil) echo >&2 "usage: $0 HOST:RDPY/LDPY PROG ARGS ..."; exit 2 ;;
esac
host=${1%:*} dpy=${1##*:}; rdpy=${dpy%%/*} ldpy=${dpy#*/}; shift 1

ssh -L"/tmp/.X11-unix/X$ldpy:/tmp/.X11-unix/X$rdpy" -Nafx "$host"
sleep 1
trap 'trap - INT QUIT HUP EXIT; ssh -Oexit "$host"; rm -f "/tmp/.X11-unix/X$ldpy"' INT QUIT HUP EXIT
DISPLAY=:$ldpy "$@"