删除指定目录下的所有文件及目录

#!/bin/sh
if [ -z $1 ]
then
        echo "Usage: `basename $0` dir1 dir2 dir3 dir4........."
        exit 1
fi
all_dir=$@
for dir in $all_dir
do
cd $dir 2>/dev/null
if [ $? -ne 0 ]
then
        echo "the directory isnot existed"
        exit 1
else
        for file_or_dir in `ls -a | grep -v "\.$"`
        do
                rm -rf $file_or_dir
        done
fi
done