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Undoing Things in Git

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Undoing Things in Git

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Mistakes happen - no matter how experienced you are. Using Git as your version control system, however, you have a safety net that helps you if it comes to the worst. Learn how to undo, roll back, and recover from mistakes.

Mistakes happen - no matter how experienced you are. Using Git as your version control system, however, you have a safety net that helps you if it comes to the worst. Learn how to undo, roll back, and recover from mistakes.

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Undoing Things in Git

  1. 1. Learn Version Control with Git Undoing Things in Git
  2. 2. Undoing Local Changes $ git checkout -- file.ext ! $ git reset --hard HEAD discards all local changes in a file since it was last committed discards all local changes in your working copy - resetting your project completely to the last committed state Discarding uncommitted local changes cannot be undone!
  3. 3. Fixing the Last Commit $ git commit -m “Fix bug #300” ! $ git add forgotten-change.txt ! $ git commit --amend -m “Fix bug #299” D’oh! Wrong bug number and forgot to add a change… simply add the change(s) as usual… …and commit using the “--amend” option with the correct message “--amend” lets you fix (only) the very last commit very easily. Since this rewrites history, never amend commits that have already been pushed to a remote repository!
  4. 4. Reverting Commits C1 $ git revert 8c1f20a C3 C4 Modifies “index.html” in the “opposite” way: (old) <div>About</div> (new) <div>About This Project</div> C2 Modified “index.html”: (old) <div>About This Project</div> (new) <div>About</div> Reverting Commit “git revert” creates a new commit (C4) that reverts the effects of a specified commit (C2).
  5. 5. Resetting / Rolling Back to a Commit C1 C2 C3 C4 master HEAD C1 C2 master HEAD Before reset After reset $ git reset --hard 8c1f20a “git reset” sets your HEAD pointer (and thereby also your working copy) to an older revision. Commits that came after this revision appear to be undone.
  6. 6. Revert & Reset in a Desktop App in a desktop app like Tower right-click on a commit to access “Reset” & “Revert”
  7. 7. Learn Git with our free online book on www.git-tower.com/learn

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