Unravel a git repository in multiple ones in a historical fashion

git-unravel.sh

#! /bin/bash

# Example: ./unravel.sh myrepo

REPO=$1
BRANCH="master"

count=0
pushd $REPO
    for commit in $(git rev-list $BRANCH | tail -r) 
    do
        popd
        newrepo="$count-$commit"
        cp -r $REPO $newrepo
        pushd $newrepo
            git reset $commit
            git checkout $BRANCH .
            $rebasecount=$count+1
            git rebase HEAD~$rebasecount
            git commit --amend --date=now
        popd
        (( count++ ))
        pushd $REPO
    done
popd