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Perl Programming/Keywords/-B
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Perl -A -b Keywords
The -B keyword
-B is a file test that tests, if the file is a "binary" file (opposite of -T).
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 $_. -B 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
-B DIRHANDLE
-B EXPRESSION
-B FILEHANDLE
-B FILENAME
-B
See also
-T
Perl -A -b Keywords