userlaunch

#!/bin/bash
# Launches, on your X11 desktop, a program running under another user.
# Example usage:
#   sudo useradd socko
#   sudo passwd socko
#   sudo mkdir /home/socko
#   ./userlaunch socko chromium-browser
# Doing this, you could have multiple chromium-browsers under multiple users running concurrently on one single desktop.

ul_user=$1
ul_program=$2
ul_display=$3

if test -z "$ul_program" || test -z "$ul_user"; then
    echo "usage: $0 user program [display]"
    echo "if no display is specified, I will assume it's already defined."
    exit 1
fi

test -z "$ul_display" && ul_display=$DISPLAY

chmod o+r ~/.Xauthority
su $ul_user -c "XAUTHORITY=$HOME/.Xauthority DISPLAY=$ul_display $ul_program"
chmod o-r ~/.Xauthority