#!/bin/bash
echo -e "Please input a filename, I will check the filename  type and permission\n\n"
read -p "Input a filename:" filename
# 判断是否输入了的文件名，如果没有输入了就停止运行
# test -z $filename 判断filename是否为空字符串
test -z $filename && echo "You Must input a filename" && exit 0
# 如果文件不存在 
# test -e 判断文件存在 ! 表示相反
test ! -e $filename && echo "The filename ‘$filename‘ DO NOT exist" && exit 0

# 判断档案是文件还是目录
test -f $filename && filetype="regulare file"
test -d $filename && filetype="directory"
# 判断档案对于当前用户的权限（读、写、执行）
test -r $filename && perm="readable"
test -w $filename && perm="$perm writable"
test -x $filename && perm="$perm executable"

echo "The filename: $filename is a $filetype"
echo "And the permissions are: $perm"