shell是个什么文件夹

shell是外壳的意思

*** 作系统有一个内核，但是用户不可能直接接触到内核，只能通过图形界面或者是其他的用户界面（即外壳）来与系统内核进行沟通

#! /bin/bash

# filename:FileType.sh

read -p "Please input the filename :" filename

fpath=$filename

if [ -d $fpath ]

then

echo "$fpath is a direstory."

elif [ -e $fpath ]

then

echo "$fpath is a file."

else

echo "$fpath is NOT a file or direstory."

fi