SHELL

git undo merge

git reset --hard HEAD~1

Undo git merge

git reset --merge HEAD~1

git revert merge

git revert -m 1 <merge-commit>

revert last merge git

git revert -m 1 commit_hash

git undo merge

git reset --hard HEAD~1
git reset --hard <commit_sha>

how to revert a merge locally

git reset --hard <cbm>

where cbm is the commit number before the merge you want to revert
to get a list of all the merges you can use the following line

git log --graph

and then use the commit number from the one before the merge you want to revert

undo merge

// find the commit hash
git log --oneline

git revert -m 1 [commit-hash]

// https://www.datree.io/resources/git-undo-merge

revert local merge

git reset --merge origin/master