Difficult. 512 bytes per entry + 1024 (EOF). See man 5 tar. But since files will be padded there is some extra overhead. Also, it is hard to calculate hard links and sparse files. Tar will handle these correctly (i.e. preserve hard links and detect sparse files and try not archive "blocks of nulls") but it is hard to calculate the size because of this before the archive operation
because of this.

Thanks.  I have been able to come close, but not exact.

Looks like close will have to be good enough.

Thanks again.


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