git: find not merged branches

To find branches that were not merged with master, use the --no-merged flag:

# or git branch -a --no-merged master
git branch -a --no-merged

Branches that were merged with feature:

git branch -a --merged feature

Branches that were not merged with feature:

git branch -a --no-merged feature

Reference

with the --contains flag shows only the branches that contain the named commit (in other words, the branches whose tip commits are descendants of the named commit).
with --merged shows only branches merged into the named commit (i.e. the branches whose tip commits are reachable from the named commit).
with --no-merged shows only branches not merged into the named commit.
if the <commit> argument is missing, it defaults to HEAD (i.e. the tip of the current branch).

Tags: git