Linux目录递归改变文件名大小写的shell

[root@localhost Desktop]# ls
experiment-2.6-new.tar.bz2
dg_dir_files.sh
experiment

#!/bin/sh
#http://www.wenzizone.cn/?p=313
#递归遍历目录的脚本，本脚本实现递归遍历指定目录，打印目录下的文件名（全路径）。
function scandir() {
    local cur_dir parent_dir workdir
    workdir=$1
    cd ${workdir}
    if [ ${workdir} = "/" ]
    then
        cur_dir=""
    else
        cur_dir=$(pwd)
    fi
 
    for dirlist in $(ls ${cur_dir})
    do
        if test -d ${dirlist};then
            cd ${dirlist}
            scandir ${cur_dir}/${dirlist}
            cd ..
        else
            #在Linux系统下批量改变文件名字的大小写
            for file in `ls | grep '[A-Z]'`
            do
                  str=`echo $file|tr 'A-Z' 'a-z'`
                  mv $file $str
            done
        fi
    done
}
 
if test -d $1
then
    scandir $1
elif test -f $1
then
    echo "you input a file but not a directory,pls reinput and try again"
    exit 1
else
    echo "the Directory isn't exist which you input,pls input a new one!!"
    exit 1
fi