tape archive. list directory contents. display free space. gunzip's not posix( though is neither tar or cpio and pax wasn't even in the original). man(1), i

tape archive. list directory contents. display free space. gunzip's not posix( though is neither tar or cpio and pax wasn't even in the original). man(1), intro(2), intro(4), intro(8) (recursive-documentation? man man) % man man