Steps to clear out the history of a git/github repository

git-clearHistory

-- Remove the history from 
rm -rf .git

-- recreate the repos from the current content only
git init
git add .
git commit -m "Initial commit"

-- push to the github remote repos ensuring you overwrite history
git remote add origin git@github.com:<YOUR ACCOUNT>/<YOUR REPOS>.git
git push -u --force origin master

thanks, very usefull

Really helpful, saved my day

thanks!

Im afraid you can still reference specific "deleted" commits by hash, eventough they don't appear in history

This might be problematic with repositories with git submodules.
I believe the recipe in this SO answer is a safer way: https://stackoverflow.com/a/13102849

git checkout --orphan newBranch
git add -A  # Add all files and commit them
git commit
git branch -D master  # Deletes the master branch
git branch -m master  # Rename the current branch to master
git push -f origin master  # Force push master branch to github
git gc --aggressive --prune=all     # remove the old files

This saved my day .. an is working "nearly" automatic.

Warning : this does not delete pull request history (discussion, file changes). If you do this in order to delete sensitive data, you should better delete the github repo (along with all its pull request history etc..) and recreate a new one from scratch.

Thanks it was very useful

Above didn't work but the following worked with more attributes during the push.

git init
git add .
git commit -m 'Initial commit'
git remote add origin [repo_address]
git push --mirror --force

Perfect !!!

Just a small comment :
rm -rf .git <------ use this command from git bash.. as i was initially using dos command prompt

Thanks, man!

Great help, thanks.

Thank you!

Great help! Thank you

It works perfectly ! Thank you !

Thanks!

This did work for me, but initially I ran into problems after the two last lines (with my account and repo name, of course):

git remote add origin git@github.com:<YOUR ACCOUNT>/<YOUR REPOS>.git
git push -u --force origin master

After running the last command, which failed, I started to get error messages for every command I used. I was not allowed to push. For example:

git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

In my case, the solution was to follow this guide to use HTTPS instead of SSH:
https://help.github.com/articles/changing-a-remote-s-url/

@heshanik, the mirror tag is exactly what I was looking for. Wanted to make sure Github looked like my local repo. Thanks.

that was a great help, many thanks

awesome! thanks for share it

Wonderful ! it worked

Thank you! This one works well!

I believe you need to delete and recreate the Github remote repo to completely remove the logs. See for example Recovering a commit from Githubs reflog.

Using the Github API described there, you access commits that are stored on Github don't appear in the normal commit history on Github.

With this method, you don't know have to know the SHA of a commit you are looking for.

Also, if the project in question is public, it appears the API calls to review the history are also public.

Thanks Heshanlk this worked for me, after adding

git remote rm origin

before the line

git remote add origin [repro address]

'cause I was receiving:
fatal: remote origin already exists

1. I want to do it from the github desktop. Is there any way??
2. Can some one give the final commands which worked to remove history? Are these commands need to be typed from gitbash or command prompt?

Worked great, useful!

for a gist the add orgin looks like git remote add origin git@gist.github.com:38238742938479283iuweyrwieury83472837.git

If you want an empty repom then pass the --allow-empty flag on commit:

git commit -S -m "Initial commit" --allow-empty

or else you'll get the following message:

On branch master

Initial commit

nothing to commit

This worked for me. Thanks.