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Perl Programming/Keywords/-T
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Perl -s -t Keywords
The -T keyword
-T is a file test that tests if the filehandle is opened to a TTY.
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 $_. -T 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
-T DIRHANDLE
-T EXPRESSION
-T FILEHANDLE
-T FILENAME
-T
See also
-B
Perl -s -t Keywords
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