Perl Programming/Keywords/-d
The -d keyword
edit-d is a file test that tests, if the file is a directory.
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 $_. -d 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
edit -d DIRHANDLE
-d EXPRESSION
-d FILEHANDLE
-d FILENAME
-d