[Git 常見問題] How to delete all commit history in github?

 Source From Here

Question
I want to delete all commit history but keep the code in its current state because, in my commit history, there are too many unused commits.

How can I do it?

HowTo
Deleting the .git folder may cause problems in your git repository. If you want to delete all your commit history but keep the code in its current state, it is very safe to do it as in the following:

1. Checkout

# git checkout --orphan latest_branch

2. Add all the files

# git add -A

3. Commit the changes

# git commit -am "commit message"

4. Delete the branch

# git branch -D master

5. Rename the current branch to master

# git branch -m master

6. Finally, force update your repository

# git push -f origin master