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Perl in a Nutshell

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Function Reference
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fileno filehandle

Returns the file descriptor for a filehandle. (A file descriptor is a small integer, unlike the filehandle, which is a symbol.) It returns undef if the handle is not open. It's useful for constructing bitmaps for select, and for passing to certain obscure system calls if syscall is implemented. It's also useful for double-checking that the open function gave you the file descriptor you wanted.

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