linux 目录是否存在命令

#shell判断文件夹是否存在

#如果文件夹不存在，创建文件夹

if [ ! -d "/myfolder" ]then

mkdir /myfolder

fi

#shell判断文件,目录是否存在或者具有权限

folder="/var/www/"

file="/var/www/log"

# -x 参数判断 $folder 是否存在并且是否具有可执行权限

if [ ! -x "$folder"]then

mkdir "$folder"

fi

# -d 参数判断 $folder 是否存在 《Linux就该这么学》 一起学习linux

if [ ! -d "$folder"]then

mkdir "$folder"

fi

# -f 参数判断 $file 是否存在

if [ ! -f "$file" ]then

touch "$file"

fi

# -n 判断一个变量是否有值

if [ ! -n "$var" ]then

echo "$var is empty"

exit 0

fi

# 判断两个变量是否相等

if [ "$var1" = "$var2" ]then

echo '$var1 eq $var2'

else

echo '$var1 not eq $var2'

fi

目录

1、检查/etc/passwd文件，确认home目录是否存在；

2、检查/etc/fstab文件，确认home目录是否挂载；

3、检查/etc/default/useradd文件，确认HOME=/home是否存在；

4、检查/etc/login.defs文件，确认HOME=/home是否存在；

5、检查/etc/profile文件，确认HOME=/home是否存在；

6、检查/etc/skel文件，确认home目录是否存在；

7、检查/etc/profile.d/目录，确认HOME=/home是否存在；

8、检查/etc/environment文件，确认HOME=/home是否存在；

9、检查/etc/default/useradd文件，确认HOME=/home是否存在；

1. shell判断文件,目录是否存在或者具有权限

2. #!/bin/sh

3.

4. myPath="/var/log/httpd/"

5. myFile="/var /log/httpd/access.log"

6.

7. # 这里的-x 参数判断$myPath是否存在并且是否具有可执行权限

8. if [ ! -x "$myPath"]then

9. mkdir "$myPath"

10. fi

11.

12. # 这里的-d 参数判断$myPath是否存在

13. if [ ! -d "$myPath"]then

14. mkdir "$myPath"

15. fi

16.

17. # 这里的-f参数判断$myFile是否存在

18. if [ ! -f "$myFile" ]then

19. touch "$myFile"

20. fi

21.

22. # 其他参数还有-n,-n是判断一个变量是否是否有值

23. if [ ! -n "$myVar" ]then

24. echo "$myVar is empty"

25. exit 0

26. fi

27.

28. # 两个变量判断是否相等

29. if [ "$var1" = "$var2" ]then

30. echo '$var1 eq $var2'

31. else

32. echo '$var1 not eq $var2'

33. fi

-f 和-e的区别

Conditional Logic on Files

-a file exists.

-b file exists and is a block special file.

-c file exists and is a character special file.

-d file exists and is a directory.

-e file exists (just the same as -a).

-f file exists and is a regular file.

-g file exists and has its setgid(2) bit set.

-G file exists and has the same group ID as this process.

-k file exists and has its sticky bit set.

-L file exists and is a symbolic link.

-n string length is not zero.

-o Named option is set on.

-O file exists and is owned by the user ID of this process.

-p file exists and is a first in, first out (FIFO) special file or

named pipe.

-r file exists and is readable by the current process.

-s file exists and has a size greater than zero.

-S file exists and is a socket.

-t file descriptor number fildes is open and associated with a

terminal device.

-u file exists and has its setuid(2) bit set.

-w file exists and is writable by the current process.

-x file exists and is executable by the current process.

-z string length is zero.

是用 -s 还是用 -f 这个区别是很大的！

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