Add git-merged-branches script

Signed-off-by: Joe Block <jpb@unixorn.net>

README.md

@@ -104,6 +104,7 @@ If you wrote one of these scripts and want it removed from this collection, plea
 | `git-ls-object-refs` | Ryan Tomayko's dotfiles | Find references to an object with SHA1 in refs, commits, and trees. All of them. |
 | `git-maildiff` | Sanjeev Kumar's blogpost | A simple `git` command to email diff in color to reviewer/ co-worker. |
 | `git-maxpack` | John Wiegley's [git-scripts](https://github.com/jwiegley/git-scripts) | Compress a repository's pack files as much as possible. |
+| `git-merged-branches` | Sergei Boiko's [Git housekeeping tutorial: clean-up outdated branches in local and remote repositories](https://railsware.com/blog/git-housekeeping-tutorial-clean-up-outdated-branches-in-local-and-remote-repositories/) article | Lists all branches that have been merged |
 | `git-move-commits` | Corey Oordt's [git-scripts](https://github.com/coordt/git-scripts/blob/master/git-move-commits) | `git move-commits num-commits correct-branch` moves the last n commits to correct-branch (creating it if necessary). |
 | `git-neck` | Leah Neukirchen's [blog](https://leahneukirchen.org/blog/archive/2013/01/a-grab-bag-of-git-tricks.html) | Show commits from the HEAD until the first branching point. Companion script for `git-trail`. |
 | `git-nuke` | Zach Holman's [dotfiles](https://github.com/holman/dotfiles) | Nukes a branch locally and on the origin remote. |

bin/git-merged-branches

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+# From https://railsware.com/blog/git-housekeeping-tutorial-clean-up-outdated-branches-in-local-and-remote-repositories/
+
+for branch in $(git branch -r --merged | grep -v HEAD)
+do
+ echo -e $(git show --format="%ci %cr %an" $branch | head -n 1) \\t$branch
+done | sort -r