How can I undo git reset --hard HEAD~1?

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To undo the effect of git reset --hard HEAD~1, you can use the git reflog command to find the commit that you were on before the reset and then use git reset --hard to reset your branch back to that commit. Here's an example:

Assuming you have the following commit history:

css
A -- B -- C (HEAD)

You accidentally performed git reset --hard HEAD~1 and ended up with this history:

css
A -- B (HEAD)
     \
      C (Unreachable)

Here's how you can undo the reset and get back to commit C:

  1. Find the commit hash of the commit you want to revert to. You can do this by using git reflog:
sh
git reflog

This will show you a list of recent actions and their corresponding commit hashes. Find the commit hash for the commit you were on before the reset (commit C in this case).

  1. Reset your branch to the commit you want to revert to using git reset --hard:
sh
git reset --hard <commit_hash>

Replace <commit_hash> with the actual commit hash of the commit you want to revert to.

Here's the complete example:

sh
# Find the commit hash using git reflog
git reflog

# Reset back to the desired commit
git reset --hard <commit_hash>

After running these commands, your branch will be reset back to the commit you specified, effectively undoing the git reset --hard HEAD~1 operation. Make sure you choose the correct commit hash to revert to.

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