Added pid to kill running version

updateWallpaper.sh

@@ -5,6 +5,7 @@ picdir=`realpath $(dirname "${BASH_SOURCE[0]}")`
 del="30m"
 sud=0
 lockfile=/tmp/updateWallpaper.lock
+kill_running=0
 
 for i in "$@"; do
 case $i in
@@ -20,12 +21,16 @@ case $i in
 		tags="${i#*=}"
 		shift
 	;;
+	-k|--kill*)
+		kill_running=1
+	;;
 	-h|--help*)
 		echo "usage: $0 <options>"
 		echo "Options:"
 		echo "  -s --start-up-delay=del  Set time between start and first image request."
 		echo "  -d --delay=del           Set delay between image requests."
 		echo "  -t --tags=tags           The actual search string. Special fields allowed."
+		echo "  -k --kill                Kill a previously running instance of the script."
 		echo "Notes:"
 		echo "  All times need to be formatted for the sleep command."
 		exit 1
@@ -37,13 +42,20 @@ esac
 done
 
 if [ -e "$lockfile" ]; then
+	kill -0 $(cat $lockfile)
+	if [ $? -eq 0 ]; then
+		if [ $kill_running -eq 0 ]; then
 			echo "Error: Lock file $lockfile exists!"
 			echo "       This most likely means another instance of the script is already running."
-	echo "       Kill it and potentially delete the lock file after that using:"
-	echo "         rm $lockfile"
+			echo "       Use -k to kill the running process."
 			exit 2;
+		else
+			echo "Warning: Killing old process..."
+			kill $(cat $lockfile)
+		fi
+	fi
 fi
-touch "$lockfile"
+echo $$ > "$lockfile"
 
 if [ "$sud" != "0" ]; then
 	sleep "$sud";