411 REFERENCE · Wikibooks
Perl Programming/Keywords/-O
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Perl -M -o Keywords
The -O keyword
-O is a file test that tests, if the file is owned by real uid.
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 $_. -O 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
-O DIRHANDLE
-O EXPRESSION
-O FILEHANDLE
-O FILENAME
-O
Perl -M -o Keywords
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