asfg.sh

#!/bin/bash -e

# Run a command as the foreground user, with their DISPLAY

if [ "$EUID" -ne "0" ]
then
    echo "not running as root"
    exit 1
fi

if [ "$#" -eq 0 ]
then
    echo "no command provided"
    exit 1
fi

USER="$(who | awk -v vt=tty$(fgconsole) '$0 ~ vt {print $1}')"
if [ -z "$USER" ]
then
    echo "logged in user not found"
    exit 1
fi

DISPLAY="$(who | awk -v vt=tty$(fgconsole) '$0 ~ vt {print $5}' | sed 's/^(\|)$//g')"
if [ -z "$DISPLAY" ]
then
    echo "logged in display not found"
    exit 1
fi

sudo -u "$USER" DISPLAY="$DISPLAY" -- "$@"