Perl Programming/Keywords/-f

The -f keyword

-f is a file test that tests, if the file is a plain file.

It takes one argument, either a FILENAME, a FILEHANDLE, or a DIRHANDLE to test the associated file to see, if something is true about it. If the argument is omitted, it tests $_. -f returns 1 for true and an empty string for false. If the file doesn't exist or can't be examined, it returns undef and sets $! (errno).

Syntax

  -f DIRHANDLE
  -f EXPRESSION
  -f FILEHANDLE
  -f FILENAME
  -f