> That's difficult to do, since a two-letter short option violates POSIX > recommendations. -7z should be equivalent to -7 -z should be equivalent > to -z -7, but we already have -z. All the truth.
> On the other hand, using _just_ -7 might be feasible as the short option, > since that complies with POSIX. And this is not a good idea, because numbers are reserved for devices defined in /etc/default/tar in for example SCO UNIX and maybe in other UNIX-es too. There are some unused (in tar) letters in alphabet yet... ;-) 'J' (bigger compression than bzip2, 'J' looks a bit like '7')? 'q' (like quick for lzop)? I would propose [-]q|--lzop and [-]J|--7zip. -- Jan Psota
