A revert option, like 'checkout' to undo just a single commit

[Shivashis Padhi]

Now, the checkout options undos all the changes made after the target commit.

A revert option should ideally only undos that commit, and create a new commit with the change.

[Shivashis Padhi]

git revert fails for changes on a single file. To reproduce

mkdir temp
touch one.txt
# make first change
git add one.txt
git commit one.txt -m "one"
# make change second
git commit one.txt -m "two"
# make change third
git commit one.txt -m "three"
# git log, see hash of second commit say $H
git revert $H 
# gives merge conflict

it works, when the head change is on a different file.