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NAME

binmode - prepare binary files on old systems


SYNOPSIS

binmode FILEHANDLE


DESCRIPTION

Arranges for the file to be read or written in ``binary'' mode in operating systems that distinguish between binary and text files. Files that are not in binary mode have CR LF sequences translated to LF on input and LF translated to CR LF on output. Binmode has no effect under Unix; in MS-DOS and similarly archaic systems, it may be imperative--otherwise your MS-DOS-damaged C library may mangle your file. The key distinction between systems that need binmode() and those that don't is their text file formats. Systems like Unix, MacOS, and Plan9 that delimit lines with a single character, and that encode that character in C as "\n", do not need binmode(). The rest need it. If FILEHANDLE is an expression, the value is taken as the name of the filehandle.


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--Tom Christiansen, Perl Documentation Compiler and Editor


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