Bash script to remove all revisions from github or gist repository.

gitclean.sh

#!/bin/bash
#
# By Zibri (2019)
# Modified by @rokibhasansagar
#
# Usage: gitclean  git-repo-url
#
gitclean ()
{
    git clone "$1" workDir && {
        cd workDir/
        for BR in $(git branch | tr " " "\n" | grep -v '*')
        do
            echo "working on branch $BR"
            git checkout $BR
            git checkout --orphan cross
            git add -A
            git commit -m "Initial Commit" && {
                git branch -D $BR
                git branch -m $BR
                git push -f origin $BR
                git gc --aggressive --prune=all
            }
        done
    }
    cd $currDir
    rm -rf workDir
}