git filter-branch example

git-filter-branch-example.sh

#!/bin/bash

git filter-branch --index-filter \
	'git rm --cached -qr --ignore-unmatch -- . &&
	git reset -q $GIT_COMMIT --
	bin/post-slack
	zsh/functions/post-slack'
	--prune-empty -- --all

git filter-branch -f --tree-filter \
	'mv -f zsh/functions/post-slack post-slack ||
	mv -f bin/post-slack post-slack || true' \
	--prune-empty -- --all

git rebase -i # and do some manual job