http://stackoverflow.com/questions/927358/how-do-you-undo-the-last-commit revert a commit: git revert <commit>

git log --pretty=oneline --abbrev-commit

update commits timestamp git commit --amend --date="Thu Sep 29 16:12:30 2016 +0800"

• redo last commit: git reset HEAD~

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Find the first commit: git rev-list --max-parents=0 HEAD http://stackoverflow.com/questions/5188914/how-to-show-first-commit-by-git-log

Rebase onto the first commit

git rebase -i --root master

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get the last commit

git rev-parse HEAD

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fetch pull requests locally

edit git config file:

``` [remote "upstream"]

fetch = +refs/pull//head:refs/remotes/upstream/pr/

```

Recover file from commit git checkout <COMMIT>^ -- "<FILE_PATH>"