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git reflog # determine pre-rebase head number, N
git reset --hard HEAD@{N}
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The easiest way would be to find the head commit of the branch as it was
immediately before the rebase started in the reflog
git reflog
and to reset the current branch to it (with the usual caveats about being
absolutely sure before reseting with the --hard option).
Suppose the old commit was HEAD@{2} in the ref log:
git reset --hard HEAD@{2}
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# Step 1: Find the commit SHA before the rebase using git reflog
$ git reflog
# Step 2: Reset the branch to the commit before the rebase
$ git reset --hard <commit-SHA>