binmode
binmode - prepare binary files on old systems
binmode FILEHANDLE
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 DOS
and similarly archaic systems, it may be imperative--otherwise your
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 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.