delete file from commit in git

delete_file_from_commit

$ git verify-pack -v .git/objects/pack/pack-4d5c6dc98db773d7df9c01d5d645ff954bfa2e49.idx | sort -k 3 -n | tail -3

61cad2a1f34f09b77e127e0a7f0748917d7d5c78 blob   557568 555456 492171
d655b4e185c0e2853bf946121cb96a55bc95bd65 blob   2436608 2435171 143444913
3541fcf92467242889f0b5a574405650dc461341 blob   140146688 140186258 1644162


$ git rev-list --objects --all | grep 3541fcf92

3541fcf92467242889f0b5a574405650dc461341 pkg/youtube_it-1.2.7.gem

$ git log --pretty=oneline --all -- pkg/youtube_it-1.2.7.gem

3e550a28267f0ba40158148f250cdec2a0a8daa4 remove older gems
a763e09e9ae6c22fc86dad2d66aaa9f088885ac1 remove older gems

$ git filter-branch --index-filter 'git rm  --ignore-unmatch pkg/youtube_it-1.2.7.gem' --tag-name-filter cat -- --all

$ rm -Rf .git/refs/original

$ git gc --aggressive --prune=now

$ git push origin master --force