A file descriptor is just a number local to your program, in effect enumerating your open files. Well known file descriptors are 0 (usually pointing to STDIN), 1 (STDOUT) and 2 (STDERR)
I don't see any advantage in this case, but I'm no expert on this. Maybe it was a miscomunication and he just meant to use $fd filehandles instead of FD filehandles!?
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