Push merges?

["Ryan Leigh" <ryanl.pi@gmail.com>]

Hello all,

I've been getting to know git and I've stumbled across a "problem" and
I haven't yet been able to find a solution. For example, say I have a
branch "base" and two branches of that "foo" and "bar". I make some
change in "base", commit it, and now I would like to have it in both
"foo" and "bar". Is there a command that rather than get another
branch and merge with the current branch will instead take the current
branch and apply a merge on other branches? I've done google searches
and looking through documentation and tutorials and I can't seem to
find an answer one way or another. I wanted to make sure that before I
go write some script to handle it that what I am looking for isn't
already a feature.

Thank you,
Ryan