[U-Boot-Users] Delete all env vars except read onlys

[Scott Wood <scottwood@freescale.com>]

Wolfgang Denk wrote:
> In message <m23arxun23.fsf@ohwell.denx.de> you wrote:
>> Why not do both? Unix untilities do it sometimes this way: Use an
>> interactive check for "scrubenv" but allow "scrubenv -force" not to
>> ask. As many of the U-Boot users know Unix, this would follow from
>> the "principle of least surprise"...
> 
> That would be exactly the other way round, i. e. provide an optional
> "-i" argument like "rm *" is doing in Unix.
> 
> The default shall be not to ask any questions.

rm defaults to not asking questions in *some* cases, but to asking in 
others.  Hence the -f flag to rm.

-Scott