shell判断文件是否存在的方法

发布时间:2019-09-04编辑:脚本学堂
本文介绍了shell判断文件是否存在与目录权限的方法,有需要的朋友参考下。

一例shell/ target=_blank class=infotextkey>shell脚本,判断文件,目录是否存在或具有权限。
 

复制代码 代码示例:
#!/bin/sh 
# www.jb200.com
#
myPath="/var/log/httpd/" 
myFile="/var /log/httpd/access.log" 
 
# 这里的-x 参数判断$myPath是否存在并且是否具有可执行权限 
if [ ! -x "$myPath"]; then 
 mkdir "$myPath" 
fi 
 
# 这里的-d 参数判断$myPath是否存在 
 if [ ! -d "$myPath"]; then 
 mkdir "$myPath" 
 fi 
  
# 这里的-f参数判断$myFile是否存在 
if [ ! -f "$myFile" ]; then 
 touch "$myFile" 
fi 
 
# 其他参数还有-n,-n是判断一个变量是否是否有值 
if [ ! -n "$myVar" ]; then 
 echo "$myVar is empty" 
 exit 0 
fi 
 
# 两个变量判断是否相等 
if [ "$var1" = "$var2" ]; then 
 echo '$var1 eq $var2' 
 else 
 echo '$var1 not eq $var2' 
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!