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Random wallpaper change script for Linux

This script would change wallpaper at regular intervals in a random manner. The script can also be killed at any time from any terminal. just like pulseaudio.
#For eg. my-laptop>$ ./wallpaper-changer.sh kill

Usage: wallpaper-change.sh [option]
[option] = kill : Kill all running instances of the script
= change : Change the wallpaper
= dir : Change the wallpaper directory to
= -h : Display this help.

===============================================
#!/bin/bash
# Wallpaper randomizer script
# written by JOnes v4.1.5
# this script keeps rotating the wallpapers at a fixed interval and does it randomly.
# It goes into background. You can either kill it manually or use the "kill" switch as a command line parameter.


# location of wallpapers / pics.
wallpaperdir="$HOME/Pictures"

# wallpaper change interval time in seconds. Cannot changed during runtime.
changetime=1800



# do not have to edit beyond this line
#------------------------------------------

helpme(){
# help menu
echo
echo "Usage: " `basename $0` "[option] "
echo "[option] = kill : Kill all running instances of the script "
echo " = change : Change the wallpaper"
echo " = dir : Change the wallpaper directory to "
echo " = -h : Display this help."
exit
}

if [ "$1" != "" ]
then
# if no command line parameter supplied then move on.

if [ "$1" == "kill" ]
then
# if command line parameter is "kill" then kill all running instances of this script.

nnn=`ps aux | grep $0 | tr -s " " | cut -d" " -f2 `
echo -e $$ "\n====" # prints PID of this instance of script. make sure not to kill itself.
for ii in `echo $nnn`
do
if [ "$ii" -ne "$$" ]
then
echo "Killing PID:" $ii
kill -9 $ii
fi
done
exit
# else if echo $1 | grep '^[0-9]*$' ] ; then
# changetime=$1
# echo $changetime
# exit
# fi
# modify wallpaer rotation time

elif [ "$1" == "change" ]
then
# if command line parameter is "change" then change the wallpaper.

cd $wallpaperdir
pic=`ls | sort -R | tail -n1 `

picfullname="$PWD/$pic"
echo "Changing wallpaper to :" $picfullname
echo
gconftool-2 -t str --set /desktop/gnome/background/picture_filename "$picfullname"
exit
elif [ "$1" == "dir" ]
then
# if CLI parameter is "dir" then change the wallpaper directory.

if [ "$2" == "" ]
then
echo "No directory name given."
helpme
echo
exit
elif [ ! -d "$2" ]
then
echo "Directory does not exist."
echo
exit
else
wallpaperdir="$2" # set wallpaper directory temporarily
# kill running instances and spawn a new one with modified wallpaper directory

nnn=`ps aux | grep $0 | tr -s " " | cut -d" " -f2 `
for ii in `echo $nnn`
do
if [ "$ii" -ne "$$" ]
then
kill -9 $ii
fi
done
fi
elif [ "$1" == "-h" ]
then
# -h : help menu
helpme
else
helpme
fi
fi

cd $wallpaperdir
hrs=$(($changetime/3600))
mins=$(($changetime/60))

echo
echo "Wallpaper directory : " $wallpaperdir
echo "Wallpaper change interval time:" $hrs "h" $mins "m"
echo

{
while [ 1 ]
do

pic=`ls *.jpg *.png *.bmp *.gif| sort -R | tail -n1 `

picfullname="$PWD/$pic"
gconftool-2 -t str --set /desktop/gnome/background/picture_filename "$picfullname"
echo "Changing wallpaper to :" $picfullname
echo

sleep $changetime

done
}&

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