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Arranges for the file to be treated in binary mode on operating systems that distinguish between binary and text files. It should be called after open but before any I/O is done on the filehandle. The only way to reset binary mode on a filehandle is to reopen the file.

binmode has no effect under Unix, Plan9, or other systems that use a single \n (newline) character as a line delimiter. On systems such as Win32 or MS-DOS, binmode is needed to prevent the translation of the line delimiter characters to and from \n .