linux常用文件判断

一、文件测试运算符

-d file     检测文件是否是目录，如果是，则返回 true。     [ -d $file ] 返回 false。
-f file     检测文件是否是普通文件（既不是目录，也不是设备文件），如果是，则返回 true。    [ -f $file ] 返回 true。
-r file     检测文件是否可读，如果是，则返回 true。  [ -r $file ] 返回 true。
-w file     检测文件是否可写，如果是，则返回 true。  [ -w $file ] 返回 true。
-x file     检测文件是否可执行，如果是，则返回 true。     [ -x $file ] 返回 true。
-s file     检测文件是否为空（文件大小是否大于0），不为空返回 true。     [ -s $file ] 返回 true。
-e file     检测文件（包括目录）是否存在，如果是，则返回 true。    [ -e $file ] 返回 true。

二、判断文件是否存在

FILE_PATH=/xx/xx/xxx.log
if [ -f "$FILE_PATH" ];then
    echo "$FILE_PATH 存在"
else
    echo "$FILE_PATH 不存在"
fi

三、判断文件是否存在，以及是否具有可执行权限

FILE_PATH=/xx/xx/xxx.log
if [ -x "$FILE_PATH" ];then
   echo "$FILE_PATH 文件存在"
else
   FILE $FILE_PATH
fi

四、判断目录是否存在

FILE_PATH=/xx/xx
if [ -d "$FILE_PATH" ];then
   echo "$FILE_PATH 存在"
 else
    echo "$FILE_PATH 不存在"
fi

五、判断变量是否有值

if [ -n "$1" ];then
    echo "存在"
else
    echo "不存在"
fi

六、以下是一些不是很常用的判断

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.

七、参考博文

判断文件是否存在的shell脚本代码

Shell 基本运算符