% hg commit -m "cvs sync"
(Tip from my Sylvain on my blog: you can combine the last two lines into just <tt>hg commit -A -m "cvs sync"</tt>; once in a while I end up with leftover CVS .foo.12.3 files that I don't want committed though, so it's nice to be able to verify before committing.) Then, you need to update your local clone(s):
% cd mozilla