[PATCH 1/2 v3] commit.rc: Add helper for math operation using bc

[Alex Elder]

On Fri, 2011-09-23 at 16:15 +0200, Lukas Czerner wrote:
> Sometimes using bash $(()) math might not be enough due to some
> limitation (big numbers), so add helper using 'bc' program. For
> now the results are only in perfect numbers (as in bash) since this is
> all I need for now.
> 
> Signed-off-by: Lukas Czerner <lczerner at redhat.com>

Clever.  This looks OK to me.  I'd like to hear what
others think.

If it gets committed maybe we should revisit tests
to see if using this function is warranted elsewhere.
Boris Ranto's recent test (which I am on the verge
of committing) in particular would be better the
way it was originally posted, making use of this.

Reviewed-by: Alex Elder <aelder at sgi.com>