I would be
very helpful if you could explain why you want to do this, ie, the application?
If you want to split some big file because it doesn't fit on a CD, just open the input file and start writing to an output file. Keep track of the number of bytes written, when its too big, start a new file (outfile_part1, outfile_part2, etc).
I think there is a *nix utility that does file splitting, but not necessarily on line boundaries.
I have no idea at all what you mean or intend by "virtual file".
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