lockscreen.sh

#!/bin/bash
################################################
# Monitor X idle time.  Lock screen when idle.

IDLETIME="5" # in minutes

################################################

function getidle () {
    # Get idle in seconds instead of ms
    echo $(( $(xprintidle) / 1000))
}

function lockscreen () {
    # check for running instance of slimlock
    if [[ $(pgrep slimlock) ]]
    then
        echo "Existing instance detected."
    else
        slimlock
    fi
}


# minutes to seconds
IDLE=$(($IDLETIME * 60))

while true
do
    IDLESEC=$(getidle)
    if (( "$IDLESEC" >= "$IDLE" ))
    then
        lockscreen
        # Reset IDLESEC to force full sleep period
        IDLESEC=0
    fi
    sleep $(( $IDLE - $IDLESEC ))
done