Find the top committers to a file

Mercurial:

$ hg log ./.hgignore | grep user: | sort | uniq -c | sort -r | head -3  
   5 user:        Michael <michael@foomail.com>  
   3 user:        Mary <mary@barmail.com>  

Git:

$ git log ./.gitignore | grep ^Author: | sort | uniq -c | sort -r | head -3
   6 Author: Michael <michael@foomail.com>
   2 Author: Mary <mary@foomail.com>

CVS:

$ cvs log ./foo/bar.cpp | grep author | awk '{print $5}' | sort | uniq -c | sort -r | head -3
  92 Michael;
  72 Mary;