I recently installed kde5 on debian stretch.  I have a yubikey which I use to log in with.  I'd like to lock the screen when I remove the yubikey.  I have it working with cinnamon and lxde but I can't quite get it with kde.  I can lock the screen if I run the shell script from a terminal as root but when I remove the yubikey the shell script returns error code 1.

Here's my shell scripts:

ykgone.sh

#! /bin/sh
if [ -z "$(lsusb | grep Yubikey)" ] ; then
       if [ ! -z "$(ps aux | grep cinnamon-session | grep -v grep)" ] ; then
               /bin/su rjonasz -c "DISPLAY=:0 cinnamon-screensaver-command -l"
       elif [ ! -z "$(ps aux | grep startkde | grep -v grep)" ] ; then
               /usr/bin/sudo -u rjonasz -H -i  /usr/local/bin/lockkde.sh
       else
               /bin/su rjonasz -c "DISPLAY=:0 xscreensaver-command --lock"
       fi
fi

lockkde.sh

#! /bin/sh

kde_pid=`pidof kdeinit5`
export `cat /proc/$kde_pid/environ|grep -ao 'DBUS_SESSION_BUS_ADDRESS=[[:graph:]]*'`
/usr/bin/qdbus org.freedesktop.ScreenSaver /ScreenSaver Lock

I can't seem to figure this one out.

Thanks for any help!

Randy

-- 
Even philosophers will praise war as ennobling mankind, forgetting
the Greek who said: 'War is bad in that it begets more evil than 
it kills.'

Immanuel Kant

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