find and remove large file from git history

files.txt

135207  columns/static/img/ggj/c1.png
122010  columns/static/img/ggj/c2.png
144015  columns/static/img/ggj/c3.png
121790  sites/management/commands/invitation_code.txt
121795  sites/management/commands/invitation_code.txt
121800  sites/management/commands/invitation_code.txt
121805  sites/management/commands/invitation_code.txt
210125  sites/static/img/1.jpg
131079  sites/static/img/2.jpg
109902  sites/static/img/2011-ggj/daminghu.png
123211  sites/static/img/2011-ggj/duanqiao.png
144189  sites/static/img/2011-ggj/emeishan.png

find.sh

## use "cut -c54-" to find files larger than 1MB
## use "cut -c55-" to find files larger than 100KB

git rev-list --all | while read rev; do git ls-tree -lr $rev | cut -c54- | grep -v '^ '; done | sort -u | sort -k 2 > /tmp/files.txt

reference.txt

inspired by:
http://blog.jessitron.com/2013/08/finding-and-removing-large-files-in-git.html
http://stackoverflow.com/questions/8740187/git-how-to-remove-file-from-historical-commit

remove.sh

git filter-branch --index-filter \
    'git rm --cached --ignore-unmatch path/to/large_files' \
    --tag-name-filter cat -- --all
rm -Rf .git/refs/original
git gc --aggressive --prune=now