I have a script on an embedded device that calls screen to start if a user logs in via a ssh session...

#!/bin/sh

SCREENRUNNING=`pgrep SCREEN`

if [ -z "$SCREENRUNNING" ]; then

    echo "Screen not running so let's start the Master session
    sleep 2
    screen -dmS Master
        sleep 2
        screen -x root/Master


else

    echo "Screen is already running let's connect to existing session"

    sleep 2
    screen -x root/Master

fi

However this keeps the calling script active till the screen session exits,even if it's detached.

What I want to do is have the calling script finish and exit while the screen session stays active. I've tried daemonising the screen -x lines and adding an & to the end of the screen -x lines neither of which work properly.

Ideas?