Undo a commit

git reset HEAD~

This leaves your working tree (the state of your files on disk) unchanged but undoes the commit and leaves the changes you committed unstaged (so they’ll appear as “Changes not staged for commit” in git status, and you’ll need to add them again before committing).

 

Source: https://stackoverflow.com/a/927386/2179668

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Git change last commit message (that is not yet pushed)

git commit --amend -m "updated message"

source: https://help.github.com/articles/changing-a-commit-message/#commit-has-not-been-pushed-online

Git undo last commit

source: http://stackoverflow.com/a/927386/2179668

git reset HEAD~

Git – my aliases

git config --global alias.poule 'pull'
git config --global alias.s 'status'
git config --global alias.hist 'log --pretty=format:"%h %ad | %s%d [%an]" --graph --date=short'
git config --global alias.a 'add .'
git config --global alias.pu 'pull'
git config --global alias.ac "!git add . && git commit"
git config --global alias.pp "!git pull && git push"
git config --global alias.po 'push'

My favorite is obviously “ac” because I can do
git ac -m "my commit message"
and this simple line add and commit all the modified files 🙂

And I also use a lot git pp to pull and push in one line!

Git – Create and push new branch

From this solution

git checkout -b newbranch

git push -u origin HEAD

Git – Commit all changes

Add all the changes to the commit

git commit -a -m "message"

Git – force add file to repo

Force a file to be added to the repository

git add -f <files>