unable to start or stop motion with script

[Mia_tech]

I have the following script that pretty much check for the status of motion daemon and based on that it stop it or start the daemon, I have added the command along with my username to sudoers file so I don't have to run the script with sudo credentials; however, the script is unable to start or stop the service.


#!/bin/bash
# script to start/stop motion and remove content from file
# 11/5/2012

dir=/tmp/motion

ps -e | grep motion
if [ $? -eq 0 ]; then
#motion is running and need to stop
echo "Stopping motion and removing files..."
service motion stop
if [ -d $dir ]; then
rm -rf $dir/ 2> /dev/null
fi

else
#motion is not running and need to start
echo "Starting motion..."
service motion start
fi

output when trying to start

jorge@nixboxen:~$ ./mocheck.sh
Starting motion...
chown: changing ownership of `/var/run/motion': Operation not permitted

output when trying to stop

Stopping motion and removing files...
* Stopping motion detection daemon motion
No /usr/bin/motion found running; none killed.
[ OK ]