Comment # 4 on bug 902398 from Per Jessen

(In reply to Per Jessen from comment #3)
> (In reply to Josef Reidinger from comment #2)
> > What is reason to use zast? We decided that it do not make much sense to
> > keep such backward stuff so long.
> 
> s/backward/functional/. The reason is the same it has always been: 
> 
> when working with different machines, some with a QWERTZ keyboard layout,
> one will inevitably end up typing 'zast' instead of 'yast'.  In zypper, the
> alternative form "yzpper" was introduced recently.

FYI, from the zypper changelog:

* Fri Jul 11 2014 ma@suse.de
- Add symlink yzpper -> zypper (bug#885655)