例如: if [ -d /test/test1]then
echo "目录存在"
else
mkdir -p /test/test1
fi
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!
#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
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