Bash 文件判断

Bash 文件判断

一、命令

Command	Decription
-e	Check whether the file is existed
-f	check whether it is a normal file
-s	check whether the file size is zero
-d	check whether it is the dir file
-b	check whether it is the block type file
-c	check whether it is the char type file
-p	check whether it is the pipe type file
-L	check whether it is the symbol link file
-S	check whether it is the socket type file
-r/-w/-x	check whether it is readable/writable/excuteable
-O	check whether you are the owner of the file
-N	check whether the file is changed since it is readed last time ？
f1 -nt f2	file 1 is newer than file 2
f1 -ot f2	file 1 is older than file 2

二、代码

#! /bin/bash

file="abc"

if [ -e "$file" ]

then

echo "$file is existed"

else

echo "$file is not existed"

fi

#if [ -N "$file" ]

#then

#echo "$file is changed"

#else

#echo "$file is not changed"

#fi

file1="456"

file2="123"

if [ "$file1" -nt "$file2" ]

then

echo "$file1 is newer than $file2"

else

echo "$file1 is older than $file2"

fi

# -f

# check whether it is a normal file

# -s

# check whether the file size is zero

# -d

# check whether it is the dir file

# -b

# check whether it is the block type file

# -c

# check whether it is the char type file

# -p

# check whether it is the pipe type file

# -L

# check whether it is the symbol link file

# -S

# check whether it is the socket type file

# -r/-w/-x

# check whether it is readable/writable/excuteable

# -O

# check whether you are the owner of the file

# -N

# check whether the file is changed since it is readed last time

# f1 -nt f2

# file 1 is newer than file 2

# f1 -ot f2

# file 1 is older than file 2