我遇到了这行代码:
if( -f <filename> ) { ... }
-f
似乎测试文件名是否存在,但我不确定。到目前为止,谷歌搜索没有帮助(很难用谷歌搜索“-f”),我的 Perl 书籍也没有。任何人都可以请指教吗?
最佳答案
见 perlfunc .
它列出了所有 Perl 内置函数,包括“文件测试”函数:
-X FILEHANDLE
-X EXPR
-X DIRHANDLE
-X
哪里
-X
是以下之一:-r: File is readable by effective uid/gid.
-w: File is writable by effective uid/gid.
-x: File is executable by effective uid/gid.
-o: File is owned by effective uid.
-R: File is readable by real uid/gid.
-W: File is writable by real uid/gid.
-X: File is executable by real uid/gid.
-O: File is owned by real uid.
-e: File exists.
-z: File has zero size (is empty).
-s: File has nonzero size (returns size in bytes).
-f: File is a plain file.
-d: File is a directory.
-l: File is a symbolic link.
-p: File is a named pipe (FIFO), or Filehandle is a pipe.
-S: File is a socket.
-b: File is a block special file.
-c: File is a character special file.
-t: Filehandle is opened to a tty.
-u: File has setuid bit set.
-g: File has setgid bit set.
-k: File has sticky bit set.
-T: File is an ASCII text file (heuristic guess).
-B: File is a "binary" file (opposite of -T).
-M: Script start time minus file modification time, in days.
-A: Same for access time.
-C: Same for inode change time (Unix, may differ for other platforms)
关于perl - Perl 中的 if( -f <filename> ) 有什么作用?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6172957/