随机壁纸（bash ）

闲着没事就写了一个让壁纸随机的脚本。现在还有很多bug。不过一有时间，我就会去fix的。谢谢大家的包涵。

闲话不多说。上代码。

#!/bin/bash
#	randombg.sh
#	random background .

cache=$HOME/.random_bg_cache/
bgcommand="gconftool --type string -s /desktop/gnome/background/picture_filename"

# check whether the cache directory is exist.
if [[ -e "$cache" ]]
then
:
else
echo "The cache directory is not exist."
if mkdir -p "$cache" >/dev/null 2>&1
then
echo "Creat the directory."
else
echo "Can't creat the directory."
exit 3
fi
fi

# get the picture name
Get_wallimag(){
local situ
situ=$(ls -l $cache*.jpg 2>/dev/null| wc -l)
if [ $situ -ne 0 ]
then
array=(`ls $cache*.jpg`)
local sum=`ls -l $cache*.jpg 2>/dev/null | wc -l`
local flag=$(($RANDOM % $sum))
wallpg="${array[$flag]}"
else
echo "The cache directory is empty."
echo "Please check it out."
exit 3
fi
}

Set_wallimag(){
Get_wallimag
if [  "$wallpg" = "" ]
then
echo "Get picture faild."
exit 3
fi
$bgcommand $wallpg >/dev/null 2>&1
if [ $? ]
then
:
else
echo "This job is faild."
exit 2
fi
}

# read arguments
Read_arg(){
while [[ $# -gt 0 ]]
do
parm="$1"
shift

case "$parm" in
-h | --help)
echo "-t time, --time time:
Set the delay time(minute). e.g 3
The time default is 3 minutes.
-l , --list:
List exist process.
-r , --remove:
Remove the current job.
-v , --version:
Show the current version.

Notice:
You must move some picture to $cache.
"
exit 0
;;
-v | --version)
echo "The current version:
random 0.2"
exit 0
;;
-t | --time)
TIME_CACHE="$1"
if [ -z $TIME_CACHE ]
then
echo "Need a argument.
randombg -t TIME"
exit 0
elif echo "$TIME_CACHE" | grep -q '[a-zA-Z]'
then
echo "Need a number.
randombg -t NUMBER"
exit 0
fi
TIME=$((TIME_CACHE*60))
shift
;;
-l | --list)
local num
num=$(ps -ef | grep randombg | grep -v grep|wc -l)
if [ "$num" -gt 2 ]
then
echo "There is a process exist."
ps -ef | grep "randombg" | grep -v 'grep' |head -n1| awk '{print $5"  "$9"  "$10"  "$11}'
exit 0
else
echo "There is no process exist."
exit 1
fi
;;
-r | --remove)
AIM=`ps -ef|grep randombg|grep -v grep| head -n1|awk '{print $2}'`
kill $AIM
exit 0
;;
*)
echo "Wrong input.
randombg -h"
exit 0
;;
esac
done
}

#	loop forever
Random_bg(){
: ${TIME:=300}
while :
do
Set_wallimag
sleep $TIME
done
}

#	judge is there a randombg problem.
Judge(){
if [ `ps -ef | grep randombg | grep -v grep | wc -l` -gt 2 ]
then
./randombg -l
echo -n "There is randombg problem exist.Reset it now?(y/n)y  "
read ANSWER
AIM=`ps -ef|grep randombg|grep -v grep| head -n1|awk '{print $2}'`
: ${ANSWER:=y}
case "$ANSWER" in
y|Y)
kill $AIM>/dev/null 2>&1
Random_bg &
exit 0
;;
n|N)
exit 0
;;
*)
exit 0
;;
esac
else
Random_bg &
exit 0
fi
}

#	main function
Read_arg "$@"
Judge
exit 0