Git checkout/revert to an older hash on a new branch

gistfile1.sh

# directory goes back to the hash, ALL changes AFTER hash are discarded.
# you can always merge in a different branch to update later changes.
git checkout -b <temp-branch-name> <myHashGoesHere>

# OR

# create a new branch
git checkout -b <temp-branch-name>

# reverts all files that were originally part of this hash back to their
# state at the time of the hash.
# any files that were added after this hash are not unaffected and stay
# the same.
git checkout <hash> .