SHELL中究竟该怎么检测文件是否存在

angel518

偶要检测该目录下文件是否存在，代码如下：
if [ -z "$FILENAME0" ]
then
   echo "input in_file name is NULL"
   exit;
elif [ !-f "$FILENAME0" ]
then
   echo "$FILENAME0 is not exist!\nPlease check it."
fi
[ -z "$FILENAME0" ]是检测输入文件名是否为空；
[ !-f "$FILENAME0" ]是检测文件是否存在，如果不存在，显示"$FILENAME0 is not exist!\nPlease check it."
为什么执行后显示提示信息如下：
+ [ -z ITEST.csv ]
+ [ !-f ITEST.csv ]
trfer: test: argument expected
为什么，错在哪里

nero_8888

elif [ !-f "$FILENAME0" ]
改为 elif [ ! -f "$FILENAME0" ] ,!与-f间加一个空格

angel518

[quote]原帖由 "nero_8888"]FILENAME0" ] ,!与-f间加一个空格[/quote 发表：

谢谢
但[ !-f "$FILENAME0" ]
到底需不需要加“”把变量包含啊

nero_8888

加了肯定没错，好象也可不加，但有时在判断时不加“”会有问题，我以前写shell时就碰到过。

寂寞烈火

推荐用[[]]代替[],
关于shell对文件的判断,请参阅:
http://blog.chinaunix.net/index.php?op=ViewArticle&articleId=571&blogId=126
中的详细解释

angel518

原帖由 "寂寞烈火" 发表：
于shell对文件的判断,请参阅:
http://blog.chinaunix.net/index.php?op=ViewArticle&articleId=571&blogId=126
中的详细解释

究竟该 [ -f [ filename ] ] ，还是该 [ [ -f filename ] ] 呢？

Oh~yeah

-b file
file exists and is a block device file

-c file
file exists and is a character device file

-d file
file exists and is a directory

-e file
file exists

-f file
file exists and is a regular file

-g file
file exists and has its setgid bit set

-G file
file exists and is owned by the effective group ID

-k file
file exists and has its sticky bit set

-L file
file exists and is a symbolic link

-O file
file exists and is owned by the effective user ID

-p file
file exists and is a pipe or named pipe (FIFO file)

-r file
file exists and is readable

-s file
file exists and is not empty

-S file
file exists and is a socket

-t N
File descriptor N points to a terminal

-u file
file exists and has its setuid bit set

-w file
file exists and is writeable

-x file
file exists and is executable, or file is a directory that can be searched