Locky: locks all active X sessions with a screensaver

#!/bin/bash
#
# locky: lock ALL screens at suspend or hibernate with xscreensaver

IS_ACTIVE="$( \ps u -C xscreensaver | awk '{print $1}'|grep -v USER )"
DISPLAYS_TO_CHECK="$( \ps u -C X | tail -n +2  | awk '{print $12}')"
# check if xscreensaver is running. if not, just skip on.
if [ -z "$IS_ACTIVE" ]
then :
    echo "Cannot lock screen. Going to sleep anyway..."
else
    echo "Locking the screen before sleeping."
        # run the lock command as the user who owns xscreensaver process,
        # and not as root, which won't work.
        # Feed correct display variable for user!
        echo "$IS_ACTIVE"|while read line;
        do
        user="$(getent passwd $line |awk -F : '{print $1}')"
            echo "$DISPLAYS_TO_CHECK"|tr " " "\n"|while read displays;
            do
                if dpyinfo=$(su - $user -c "xdpyinfo -display ${displays}.0 2>&1 1>/dev/null"); then
                    echo "$user : DISPLAY=$displays /usr/bin/xscreensaver-command -lock $dpyinfo"
                    break;
                    su - $user -c "DISPLAY=$displays /usr/bin/xscreensaver-command -lock" &
                else
                    echo "$dpyinfo"
                continue;
                fi
            done
        done
fi