파일 이 존재 하 는 지 판단 하 는 셸 스 크 립 트 코드

구현 코드 1,

#!/bin/sh
#         
# link：www.jb51.net
# date：2013/2/28

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

#    -x     $myPath               
if [ ! -x "$myPath"]; then
 mkdir "$myPath"
fi
#    -d     $myPath    
if [ ! -d "$myPath"]; then
 mkdir "$myPath"
fi

#    -f    $myFile    
if [ ! -f "$myFile" ]; then
 touch "$myFile"
fi
#       -n,-n             
if [ ! -n "$myVar" ]; then
 echo "$myVar is empty"
 exit 0
fi

#           
if [ "$var1" = "$var2" ]; then
 echo '$var1 eq $var2'
else
 echo '$var1 not eq $var2'
fi

구현 코드 2,

#shell         

#        ，     
if [ ! -d "/myfolder" ]; then
 mkdir /myfolder
fi

#shell    ,            

folder="/var/www/"
file="/var/www/log"

# -x      $folder                
if [ ! -x "$folder"]; then
 mkdir "$folder"
fi

# -d      $folder     
if [ ! -d "$folder"]; then
 mkdir "$folder"
fi

# -f      $file     
if [ ! -f "$file" ]; then
 touch "$file"
fi

# -n           
if [ ! -n "$var" ]; then
 echo "$var is empty"
 exit 0
fi

#           
if [ "$var1" = "$var2" ]; then
 echo '$var1 eq $var2'
else
 echo '$var1 not eq $var2'
fi

-f 와-e 의 차이
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.
-s 로 할 지-f 로 할 지 차이 가 커 요!