Difficult. 512 bytes per entry + 1024 (EOF). See man 5 tar. But
will be padded there is some extra overhead. Also, it is hard to
hard links and sparse files. Tar will handle these correctly (i.e.
hard links and detect sparse files and try not archive "blocks of
it is hard to calculate the size because of this before the archive
because of this.
Thanks. I have been able to come close, but not exact.
Looks like close will have to be good enough.
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