REQ: -g for --block-size=1G

[Greg]

Hello,

I looked through the archives and didn't see anyone ask for this
before, so I will.  I would love for 'df -g' and 'du -g' to act like
the -m option and set the block size.

It seems reasonable to have, with partitions getting larger, using the
same rationale as there being a -m.  You'll of course have 0's where
there are smaller partitions, which is the only downside I can see,
but, since it's not a default I would chalk that up as "well, you
asked for it."  I know about the -h option, but, I think this would be
good for consistency in magnitude comparison without jumbling in K's
and M's.  And, lastly in my stumping for the idea, if procps can have
it in memory sizes on Linux via 'free -g', I think it'd be an even
better fit for disk sizes.

Thanks for your time.
-Greg