revert changes by a specific user and cherry-pick the rest

gistfile1.txt

This is what I did to revert a lot of changes I had made to a branch over a 2 week period, but still keep other commits that weren't mine.

git branch old-master
git reset <commitId> --hard
for i in `git log master..old-master | grep -v "Author: Ivan Meredith" |grep -B 1 Author |grep commit | awk '{print $2}'`|tail -r; do git cherry-pick $i;done
git push origin master --force
git push origin old-master