自己买了一个柯达7590数码相机,拍了一些照片,还有点专业水准，就拿来作桌面。这么多图片到底选那一个，放弃那一个呢？最后决定，都选，都用来左桌面，让系统每30分钟自动换一个。利用系统子带的工具cron. 再加上自己编写的脚本，很容易实现。下面给出从文件夹中随机取出一副图片的脚本程序：
#!/bin/bash
#trim the charactor in head and tail
L_trim()
/*该函数取掉变量rand_time左边所有的空格：*/
{
tmp=${rand_time:0:1}
while [ $tmp = 0 ]
do
rand_time=${rand_time:1}
tmp=${rand_time:0:1}
done
}
R_trim()
/*该函数取掉变量rand_time右边所有的空格：*/
{{
Len=${#rand_time}
let "sLen =Len -1"
tmp=${rand_time:sLen:1}
while [ $tmp = 0 ]
do
rand_time=${rand_time:0:$sLen}
Len=${#rand_time}
let "sLen =Len -1"
tmp=${rand_time:sLen:1}
done
}
#get current time as random
rand_time=`date '+%N'`
#trim the "0" from the var
#rand_time=${rand_time:0:6}
L_trim
R_trim
#get filecount of $1
fcount=`ls $1 | wc -l`
echo "fcount $fcount"
#get a random number between 1 and fcount
rand_num=$(($rand_time % $fcount ))
echo $rand_num
tmp=1
for file in $1/*.jpg
do
if [ $tmp -lt $rand_num ]
then
let "tmp=tmp+1"
continue
fi
}
/*可以将随机取出的图片设为桌面：*/
#qiv -Tx $HOME/.wallpaper.jpg
echo "file:$file"
break;
done
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