On Fri, 18 Dec 2015, gregrwm wrote: > it may well be that sort behaves in accordance with the definition, if > so i say the definition has a bug. "a" should not preceed null. What it said was that when the extension begins with a number, as in .7z or .9 (which was your example), then there is no definition. I agree that seems ridiculous. It obviously is doing something and what it is doing makes no sense to me. Why should -V give unpredictable results under any conditions? Apparently, that was their plan. If you write to the developers, let us know what they say. REPORTING BUGS Report sort bugs to bug-coreutils at gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> Report sort translation bugs to <http://translationproject.org/team/> Mike