[root@localhost shell_order]# cat test27.sh 
#!/bin/bash
#print the directory and file
 
for file in /home/hustyangju/*
do
if [ -d "$file" ]
then 
  echo "$file is directory"
elif [ -f "$file" ]
then
  echo "$file is file"
fi
done
[root@localhost shell_order]# ./test27.sh 
/home/hustyangju/array is directory
/home/hustyangju/menuwindow-7.12 is directory
/home/hustyangju/menuwindow-build-desktop is directory
/home/hustyangju/shell_order is directory
[root@localhost shell_order]# 

#! /bin/bash
read_dir(){
    for file in `ls $1`       #注意此处这是两个反引号，表示运行系统命令
    do
        if [ -d $1"/"$file ]  #注意此处之间一定要加上空格，否则会报错
        then
            read_dir $1"/"$file
        else
            echo $1"/"$file   #在此处处理文件即可
        fi
    done
}
#读取第一个参数
read_dir $1

#!/bin/bash
 
function getdir(){
    for element in `ls $fd`
    do  
        dir_or_file=$fd"/"$element
        if [ -d $dir_or_file ]
        then 
            getdir $dir_or_file
        else
            echo $dir_or_file
        fi  
    done
}
root_dir="/opt/datas"
getdir $root_dir