@cJ It's present in SUSv2 (only available as PDF) hence why I said historical standard, although was already marked as obsolescent by then.
> You say nothing else needs to be remembered, but at least --one-file-system is a regular in my tar and rsync invocations.
Well never used that one, although I guess for the special case of backups I could but for me those go in scripts, including for restoring. And checking manpages while writing scripts is typically the way I go so mnemonics aren't needed. screen.png
Haha, anyway we can see from your screenshot the trend towards uniformisation of CLI arguments, back in 1994, even though the historical form was definitely more compact and could be favored by some.
A while back I was pretty surprised when I discovered my bashisms.