用SHELL编程问题，如何判断文件类型

应该是bash吧：脚本蔽森尺的写法是这样的：file_name=xxxxxxxif [ -d $file_name ]

then

echo "directory"

else

echo "not a directory"

fi 下春好面是全部参数，里面就有你需宏高要的：-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.

dos格式和unix格式差别就在于换行符。

只要把所有的换行符统一衫纤，就完成了转化，如

unix2dos 是转为dos格式

dos2unix 是转为unix格式

但是判断就不是绝对的了，因为有可能文件中漏陪既有dos换行符，也有unix换行符，因此是模糊的，并没有什么意义。

有使用返塌蠢用file 命令可以显示格式，但并不一定有效。

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