[git] How can I delete all Git branches which have been merged?

I have many Git branches. How do I delete branches which have already been merged? Is there an easy way to delete them all instead of deleting them one by one?

You can add the commit to the --merged option. This way you can make sure only to remove branches which are merged into i.e. the origin/master

Following command will remove merged branches from your origin.

git branch -r --merged origin/master | grep -v "^.*master" | sed s:origin/:: |xargs -n 1 git push origin --delete 

You can test which branches will be removed replacing the git push origin --delete with echo

git branch -r --merged origin/master | grep -v "^.*master" | sed s:origin/:: |xargs -n 1 echo

My Bash script contribution is based loosely on mmrobin's answer.

It takes some useful parameters specifying includes and excludes, or to examine/remove only local or remote branches instead of both.

#!/bin/bash

# exclude branches regex, configure as "(branch1|branch2|etc)$"
excludes_default="(master|next|ag/doc-updates)$"
excludes="__NOTHING__"
includes=
merged="--merged"
local=1
remote=1

while [ $# -gt 0 ]; do
  case "$1" in
  -i) shift; includes="$includes $1" ;;
  -e) shift; excludes="$1" ;;
  --no-local) local=0 ;;
  --no-remote) remote=0 ;;
  --all) merged= ;;
  *) echo "Unknown argument $1"; exit 1 ;;
  esac
  shift   # next option
done

if [ "$includes" == "" ]; then
  includes=".*"
else
  includes="($(echo $includes | sed -e 's/ /|/g'))"
fi

current_branch=$(git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/')
if [ "$current_branch" != "master" ]; then
  echo "WARNING: You are on branch $current_branch, NOT master."
fi
echo -e "Fetching branches...\n"

git remote update --prune
remote_branches=$(git branch -r $merged | grep -v "/$current_branch$" | grep -v -E "$excludes" | grep -v -E "$excludes_default" | grep -E "$includes")
local_branches=$(git branch $merged | grep -v "$current_branch$" | grep -v -E "$excludes" | grep -v -E "$excludes_default" | grep -E "$includes")
if [ -z "$remote_branches" ] && [ -z "$local_branches" ]; then
  echo "No existing branches have been merged into $current_branch."
else
  echo "This will remove the following branches:"
  if [ "$remote" == 1 -a -n "$remote_branches" ]; then
    echo "$remote_branches"
  fi
  if [ "$local" == 1 -a -n "$local_branches" ]; then
    echo "$local_branches"
  fi
  read -p "Continue? (y/n): " -n 1 choice
  echo
  if [ "$choice" == "y" ] || [ "$choice" == "Y" ]; then
    if [ "$remote" == 1 ]; then
      remotes=$(git remote)
      # Remove remote branches
      for remote in $remotes
      do
        branches=$(echo "$remote_branches" | grep "$remote/" | sed "s/$remote\/\(.*\)/:\1 /g" | tr -d '\n')
        git push $remote $branches
      done
    fi

    if [ "$local" == 1 ]; then
      # Remove local branches
      locals=$(echo "$local_branches" | sed 's/origin\///g' | tr -d '\n')
      if [ -z "$locals" ]; then
        echo "No branches removed."
      else
        git branch -d $(echo "$locals" | tr -d '\n')
      fi
    fi
  fi
fi

git cleanup script from the git-toolbelt

Deletes all branches that have already been merged into master or develop. Keeps other branches lying around. Will be most conservative with deletions.

Removes branches both locally and in the origin remote.

Just extending Adam's answer a little bit:

Add this to your Git configuration by running git config -e --global

[alias]
    cleanup = "!git branch --merged | grep  -v '\\*\\|master\\|develop' | xargs -n 1 git branch -d"

And then you can delete all the local merged branches doing a simple git cleanup.

Given you want to delete the merged branches, you need to delete the remote-tracking branches only, unless you state otherwise.

So to delete those branches you can do it by

git branch --remote --merged origin/master | egrep -v "(^\*|master|development)" | cut -b 10- | xargs git push --delete origin

This will delete all merged branches (merged to master) except master and development.

I've used Adam's answer for years now. That said, that there are some cases where it wasn't behaving as I expected:

1. branches that contained the word "master" were ignored, e.g. "notmaster" or "masterful", rather than only the master branch
2. branches that contained the word "dev" were ignored, e.g. "dev-test", rather than only the dev branch
3. deleting branches that are reachable from the HEAD of the current branch (that is, not necessarily master)
4. in detached HEAD state, deleting every branch reachable from the current commit

1 & 2 were straightforward to address, with just a change to the regex. 3 depends on the context of what you want (i.e. only delete branches that haven't been merged into master or against your current branch). 4 has the potential to be disastrous (although recoverable with git reflog), if you unintentionally ran this in detached HEAD state.

Finally, I wanted this to all be in a one-liner that didn't require a separate (Bash|Ruby|Python) script.

TL;DR

Create a git alias "sweep" that accepts an optional -f flag:

git config --global alias.sweep '!git branch --merged $([[ $1 != "-f" ]] \
&& git rev-parse master) | egrep -v "(^\*|^\s*(master|develop)$)" \
| xargs git branch -d'

and invoke it with:

git sweep

or:

git sweep -f

The long, detailed answer

It was easiest for me to create an example git repo with some branches and commits to test the correct behavior:

Create a new git repo with a single commit

mkdir sweep-test && cd sweep-test && git init
echo "hello" > hello
git add . && git commit -am "initial commit"

Create some new branches

git branch foo && git branch bar && git branch develop && git branch notmaster && git branch masterful
git branch --list

  bar
  develop
  foo
* master
  masterful
  notmaster

Desired behavior: select all merged branches except: master, develop or current

The original regex misses the branches "masterful" and "notmaster" :

git checkout foo
git branch --merged | egrep -v "(^\*|master|dev)"

  bar

With the updated regex (which now excludes "develop" rather than "dev"):

git branch --merged | egrep -v "(^\*|^\s*(master|develop)$)"

bar
masterful
notmaster

Switch to branch foo, make a new commit, then checkout a new branch, foobar, based on foo:

echo "foo" > foo
git add . && git commit -am "foo"
git checkout -b foobar
echo "foobar" > foobar
git add . && git commit -am "foobar"

My current branch is foobar, and if I re-run the above command to list the branches I want to delete, the branch "foo" is included even though it hasn't been merged into master:

git branch --merged | egrep -v "(^\*|^\s*(master|develop)$)"

  bar
  foo
  masterful
  notmaster

However, if I run the same command on master, the branch "foo" is not included:

git checkout master && git branch --merged | egrep -v "(^\*|^\s*(master|develop)$)"

  bar
  masterful
  notmaster

And this is simply because git branch --merged defaults to the HEAD of the current branch if not otherwise specified. At least for my workflow, I don't want to delete local branches unless they've been merged to master, so I prefer the following variant using git rev-parse:

git checkout foobar
git branch --merged $(git rev-parse master) | egrep -v "(^\*|^\s*(master|develop)$)"

  bar
  masterful
  notmaster

Detached HEAD state

Relying on the default behavior of git branch --merged has even more significant consequences in detached HEAD state:

git checkout foobar
git checkout HEAD~0
git branch --merged | egrep -v "(^\*|^\s*(master|develop)$)"

  bar
  foo
  foobar
  masterful
  notmaster

This would have deleted the branch I was just on, "foobar" along with "foo", which is almost certainly not the desired outcome. With our revised command, however:

git branch --merged $(git rev-parse master) | egrep -v "(^\*|^\s*(master|develop)$)"

  bar
  masterful
  notmaster

One line, including the actual delete

git branch --merged $(git rev-parse master) | egrep -v "(^\*|^\s*(master|develop)$)" | xargs git branch -d

All wrapped up into a git alias "sweep":

git config --global alias.sweep '!git branch --merged $([[ $1 != "-f" ]] \
&& git rev-parse master) | egrep -v "(^\*|^\s*(master|develop)$)" \
| xargs git branch -d'

The alias accepts an optional -f flag. The default behavior is to only delete branches that have been merged into master, but the -f flag will delete branches that have been merged into the current branch.

git sweep

Deleted branch bar (was 9a56952).
Deleted branch masterful (was 9a56952).
Deleted branch notmaster (was 9a56952).

git sweep -f

Deleted branch foo (was 2cea1ab).

For those of you that are on Windows and prefer PowerShell scripts, here is one that deletes local merged branches:

function Remove-MergedBranches
{
  git branch --merged |
    ForEach-Object { $_.Trim() } |
    Where-Object {$_ -NotMatch "^\*"} |
    Where-Object {-not ( $_ -Like "*master" )} |
    ForEach-Object { git branch -d $_ }
}

git-delete-merged-branches from git-extras repo.

https://github.com/tj/git-extras/blob/master/Commands.md#git-delete-merged-branches

Note: I am not happy with previous answers, (not working on all systems, not working on remote, not specifying the --merged branch, not filtering exactly). So, I add my own answer.

There are two main cases:

Local

You want to delete local branches that are already merged to another local branch. During the deletion, you want to keep some important branches, like master, develop, etc.

git branch --format "%(refname:short)" --merged master | grep -E -v '^master$|^feature/develop$' | xargs -n 1 git branch -d

Notes:

• git branch output --format ".." is to strip whitespaces and allow exact grep matching
• grep -E is used instead of egrep, so it works also in systems without egrep (i.e.: git for windows).
• grep -E -v '^master$|^feature/develop$' is to specify local branches that I don't want to delete
• xargs -n 1 git branch -d: perform the deletion of local branches (it won't work for remote ones)
• of course you get an error if you try deleting the branch currently checked-out. So, I suggest to switch to master beforehand.

Remote

You want to delete remote branches that are already merged to another remote branch. During the deletion, you want to keep some important branches, like HEAD, master, releases, etc.

git branch -r --format "%(refname:short)" --merged origin/master | grep -E -v '^*HEAD$|^*/master$|^*release' | cut -d/ -f2- | xargs -n 1 git push --delete origin

Notes:

• for remote, we use the -r option and provide the full branch name: origin/master
• grep -E -v '^*HEAD$|^*/master$|^*release' is to match the remote branches that we don't want to delete.
• cut -d/ -f2- : remove the unneeded 'origin/' prefix that otherwise is printed out by the git branch command.
• xargs -n 1 git push --delete origin : perform the deletion of remote branches.

To avoid accidentally running the command from any other branch than master I use the following bash script. Otherwise, running git branch --merged | grep -v "\*" | xargs -n 1 git branch -d from a branch that has been merged of off master could delete the master branch.

#!/bin/bash

branch_name="$(git symbolic-ref HEAD 2>/dev/null)" ||
branch_name="(unnamed branch)"     # detached HEAD
branch_name=${branch_name##refs/heads/}

if [[ $branch_name == 'master' ]]; then
   read -r -p "Are you sure? [y/N] " response
   if [[ $response =~ ^([yY][eE][sS]|[yY])$ ]]; then
       git branch --merged | grep -v "\*" | xargs -n 1 git branch -d
   fi
else
   echo "Refusing to delete branches that are not merged into '$branch_name'. Checkout master first."
fi

I use the following Ruby script to delete my already merged local and remote branches. If I'm doing it for a repository with multiple remotes and only want to delete from one, I just add a select statement to the remotes list to only get the remotes I want.

#!/usr/bin/env ruby

current_branch = `git symbolic-ref --short HEAD`.chomp
if current_branch != "master"
  if $?.exitstatus == 0
    puts "WARNING: You are on branch #{current_branch}, NOT master."
  else
    puts "WARNING: You are not on a branch"
  end
  puts
end

puts "Fetching merged branches..."
remote_branches= `git branch -r --merged`.
  split("\n").
  map(&:strip).
  reject {|b| b =~ /\/(#{current_branch}|master)/}

local_branches= `git branch --merged`.
  gsub(/^\* /, '').
  split("\n").
  map(&:strip).
  reject {|b| b =~ /(#{current_branch}|master)/}

if remote_branches.empty? && local_branches.empty?
  puts "No existing branches have been merged into #{current_branch}."
else
  puts "This will remove the following branches:"
  puts remote_branches.join("\n")
  puts local_branches.join("\n")
  puts "Proceed?"
  if gets =~ /^y/i
    remote_branches.each do |b|
      remote, branch = b.split(/\//)
      `git push #{remote} :#{branch}`
    end

    # Remove local branches
    `git branch -d #{local_branches.join(' ')}`
  else
    puts "No branches removed."
  end
end

To delete local branches that have been merged to master branch I'm using the following alias (git config -e --global):

cleanup = "!git branch --merged master | grep -v '^*\\|master' | xargs -n 1 git branch -D"

I'm using git branch -D to avoid error: The branch 'some-branch' is not fully merged. messages while my current checkout is different from master branch.

The simplest way I found to do it removing only local branches, not remote ones:

$ git branch --merged | grep -v master | xargs -n 1 git branch -D

This command will delete only branches already merged in your master one. Be careful if you don't want to delete other branches, such as a staging.

Just created python script for that:

import sys
from shutil import which
import logging
from subprocess import check_output, call

logger = logging.getLogger(__name__)

if __name__ == '__main__':
    if which("git") is None:
        logger.error("git is not found!")
        sys.exit(-1)

    branches = check_output("git branch -r --merged".split()).strip().decode("utf8").splitlines()
    current = check_output("git branch --show-current".split()).strip().decode("utf8")
    blacklist = ["master", current]

    for b in branches:
        b = b.split("/")[-1]

        if b in blacklist:
            continue
        else:
            if input(f"Do you want to delete branch: '{b}' [y/n]\n").lower() == "y":
                call(f"git branch -D {b}".split())
                call(f"git push --delete origin {b}".split())

You can use git-del-br tool.

git-del-br -a

You can install it via pip using

pip install git-del-br

P.S: I am the author of the tool. Any suggestions/feedback are welcome.

If you are using branching model like HubFlow or GitFlow you can use this command to remove the merged feature branches:

git branch --merged | grep feature.* | grep -v "\*" | xargs -n 1 git branch -d

If you'd like to delete all local branches that are already merged in to the branch that you are currently on, then I've come up with a safe command to do so, based on earlier answers:

git branch --merged | grep -v \* | grep -v '^\s*master$' | xargs -t -n 1 git branch -d

This command will not affect your current branch or your master branch. It will also tell you what it's doing before it does it, using the -t flag of xargs.

Based on some of these answers I made my own Bash script to do it too!

It uses git branch --merged and git branch -d to delete the branches that have been merged and prompts you for each of the branches before deleting.

merged_branches(){
  local current_branch=$(git rev-parse --abbrev-ref HEAD)
  for branch in $(git branch --merged | cut -c3-)
    do
      echo "Branch $branch is already merged into $current_branch."
      echo "Would you like to delete it? [Y]es/[N]o "
      read REPLY
      if [[ $REPLY =~ ^[Yy] ]]; then
        git branch -d $branch
      fi
  done
}

As of 2018.07

Add this to [alias] section of your ~/.gitconfig:

sweep = !"f() { git branch --merged | egrep -v \"(^\\*|master|dev)\" || true | xargs git branch -d; }; f"

Now you can just call git sweep to perform that needed cleanup.

kuboon's answer missed deleting branches which have the word master in the branch name. The following improves on his answer:

git branch -r --merged | grep -v "origin/master$" | sed 's/\s*origin\///' | xargs -n 1 git push --delete origin

Of course, it does not delete the "master" branch itself :)

Let's say I have a remote named upstream and an origin (GitHub style, my fork is origin, upstream is upstream).

I don't want to delete ANY masters, HEAD, or anything from the upstream. I also don't want to delete the develop branch as that is our common branch we create PRs from.

List all remote branches, filtered by ones that were merged:

git branch -r

Remove lines from that list that contain words I know are in branch names I don't want to remove:

sed '/develop\|master\|HEAD\|upstream/d'

Remove the remote name from the reference name (origin/somebranch becomes somebranch):

sed 's/.*\///'

Use xargs to call a one-liner:

xargs git push --delete origin

Pipe it all together you get:

git branch -r --merged | sed '/develop\|master\|HEAD\|upstream/d' |  sed 's/.*\///' | xargs git push --delete origin

This will leave me with only some branches that I have worked on, but have not merged. You can then remove them one by one as there shouldn't be too many.

Find branches you no longer want:

git branch -ar

Say you find branch1, branch2, and branch3 you want to delete:

git push --delete origin branch1 branch2 branch3

To delete merged branches, git-delete-merged-branches is more robust and more convenient than shell hacks. It also detects rebase merges and squash merges. Its readme has more details.

Using Git version 2.5.0:

git branch -d `git branch --merged`

Alias version of Adam's updated answer:

[alias]
    branch-cleanup = "!git branch --merged | egrep -v \"(^\\*|master|dev)\" | xargs git branch -d #"

Also, see this answer for handy tips on escaping complex aliases.

Git Sweep does a great job of this.

git branch --merged | grep -Ev '^(. master|\*)' | xargs -n 1 git branch -d will delete all local branches except the current checked out branch and/or master.

Here's a helpful article for those looking to understand these commands: Git Clean: Delete Already Merged Branches, by Steven Harman.

How to delete merged branches in PowerShell console

git branch --merged | %{git branch -d $_.Trim()}

If you want to exclude master or any other branch names, you can pipe with PowerShell Select-String like this and pass the result to git branch -d:

git branch -d $(git branch --merged | Select-String -NotMatch "master" | %{$_.ToString().Trim()})

$ git config --global alias.cleanup
'!git branch --merged origin/master | egrep -v "(^\*|master|staging|dev)" | xargs git branch -d'

(Split into multiple lines for readability)

Calling "git cleanup" will delete local branches that have already been merged into origin/master. It skips master, staging, and dev because we don't want to delete those in normal circumstances.

Breaking this down, this is what it's doing:

1. git config --global alias.cleanup
   • This is creating a global alias called "cleanup" (across all your repos)
2. The ! at the beginning of the command is saying that we will be using some non-git commands as part of this alias so we need to actually run bash commands here
3. git branch --merged origin/master
   • This command returns the list of branch names that have already been merged into origin/master
4. egrep -v "(^\*|master|staging|dev)"
   • This removes the master, staging, and dev branch from the list of branches that have already been merged. We don't want to remove these branches since they are not features.
5. xargs git branch -d
   • This will run the git branch -d xxxxx command for each of the unmerged branches. This deletes the local branches one by one.

You'll want to exclude the master, main & develop branches from those commands.

Local git clear:

git branch --merged | grep -v '\*\|master\|main\|develop' | xargs -n 1 git branch -d

Remote git clear:

git branch -r --merged | grep -v '\*\|master\|main\|develop' | sed 's/origin\///' | xargs -n 1 git push --delete origin

Sync local registry of remote branches:

git fetch -p

Below query works for me

for branch in  `git branch -r --merged | grep -v '\*\|master\|develop'|awk 'NR > 0 {print$1}'|awk '{gsub(/origin\//, "")}1'`;do git push origin --delete $branch; done

and this will filter any given branch in the grep pipe.

Works well over http clone, but not so well for the ssh connection.

Write a script in which Git checks out all the branches that have been merged to master.

Then do git checkout master.

Finally, delete the merged branches.

for k in $(git branch -ra --merged | egrep -v "(^\*|master)"); do
  branchnew=$(echo $k | sed -e "s/origin\///" | sed -e "s/remotes\///")
  echo branch-name: $branchnew
  git checkout $branchnew
done

git checkout master

for k in $(git branch -ra --merged | egrep -v "(^\*|master)"); do
  branchnew=$(echo $k | sed -e "s/origin\///" | sed -e "s/remotes\///")
  echo branch-name: $branchnew
  git push origin --delete $branchnew
done

Try the following command:

git branch -d $(git branch --merged | grep -vw $(git rev-parse --abbrev-ref HEAD))

By using git rev-parse will get the current branch name in order to exclude it. If you got the error, that means there are no local branches to remove.

To do the same with remote branches (change origin with your remote name), try:

git push origin -vd $(git branch -r --merged | grep -vw $(git rev-parse --abbrev-ref HEAD) | cut -d/ -f2)

^{In case you've multiple remotes, add grep origin | before cut to filter only the origin.}

If above command fails, try to delete the merged remote-tracking branches first:

git branch -rd $(git branch -r --merged | grep -vw $(git rev-parse --abbrev-ref HEAD))

Then git fetch the remote again and use the previous git push -vdcommand again.

If you're using it often, consider adding as aliases into your ~/.gitconfig file.

In case you've removed some branches by mistake, use git reflog to find the lost commits.

To delete all branches on remote that are already merged:

git branch -r --merged | grep -v master | sed 's/origin\//:/' | xargs -n 1 git push origin

In more recent versions of Git

git branch -r --merged | grep -v master | sed 's/origin\///' | xargs -n 1 git push --delete origin

UPDATE (by @oliver; since does not fit in comment, but enough answers already): if you are on branch ABC then ABC will appear in the results of git branch -r --merged because the branch is not specified, so branch defaults to current branch, and a branch always qualifies as merged to itself (because there are no differences between a branch and itself!).

So either specify the branch:

git branch -r --merged master | grep -v master ...

OR first checkout master:

git checkout master | git branch -r --merged | grep -v ...

If you're on Windows you can use Windows Powershell or Powershell 7 with Out-GridView to have a nice list of branches and select with mouse which one you want to delete:

git branch --format "%(refname:short)" --merged  | Out-GridView -PassThru | % { git branch -d $_ }

after clicking OK Powershell will pass this branches names to git branch -d command and delete them

On Windows with git bash installed egrep -v will not work

git branch --merged | grep -E -v "(master|test|dev)" | xargs git branch -d

where grep -E -v is equivalent of egrep -v

Use -d to remove already merged branches or -D to remove unmerged branches

For me git branch --merged doesn't show branches that were merged via GitHub PR. I'm not sure of the reasons, but I use the following line to delete all local branches that do not have remote tracking branch:

diff <(git branch --format "%(refname:short)") <(git branch -r | grep -v HEAD | cut -d/ -f2-) | grep '<' | cut -c 3- | xargs git branch -D

Explanation:

• git branch --format "%(refname:short)" gives a list of local branches
• git branch -r | grep -v HEAD | cut -d/ -f2- gives a list of remote branches, filtering out HEAD
• diff <(...) <(...) gives a diff of output of two commands inside parentheses
• grep '<' filters branches that exist in first list, but not in the second
• cut -c 3- gives line starting from 3rd character, thus removing prefix <
• xargs git branch -D executes git branch -D against each branch name

Alternatively, you can avoid grep -v '<' like this:

diff --old-line-format="%L" --new-line-format="" --unchanged-line-format="" <(git branch --format "%(refname:short)") <(git branch -r | grep -v HEAD | cut -d/ -f2-) | xargs git branch -D

I've been using the following method to remove merged local AND remote branches in one cmd.

I have the following in my bashrc file:

function rmb {
  current_branch=$(git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/')
  if [ "$current_branch" != "master" ]; then
    echo "WARNING: You are on branch $current_branch, NOT master."
  fi
  echo "Fetching merged branches..."
  git remote prune origin
  remote_branches=$(git branch -r --merged | grep -v '/master$' | grep -v "/$current_branch$")
  local_branches=$(git branch --merged | grep -v 'master$' | grep -v "$current_branch$")
  if [ -z "$remote_branches" ] && [ -z "$local_branches" ]; then
    echo "No existing branches have been merged into $current_branch."
  else
    echo "This will remove the following branches:"
    if [ -n "$remote_branches" ]; then
      echo "$remote_branches"
    fi
    if [ -n "$local_branches" ]; then
      echo "$local_branches"
    fi
    read -p "Continue? (y/n): " -n 1 choice
    echo
    if [ "$choice" == "y" ] || [ "$choice" == "Y" ]; then
      # Remove remote branches
      git push origin `git branch -r --merged | grep -v '/master$' | grep -v "/$current_branch$" | sed 's/origin\//:/g' | tr -d '\n'`
      # Remove local branches
      git branch -d `git branch --merged | grep -v 'master$' | grep -v "$current_branch$" | sed 's/origin\///g' | tr -d '\n'`
    else
      echo "No branches removed."
    fi
  fi
}

original source

This doesn't delete the master branch, but removes merged local AND remote branches. Once you have this in you rc file, just run rmb, you're shown a list of merged branches that will be cleaned and asked for confirmation on the action. You can modify the code to not ask for confirmation as well, but it's probably good to keep it in.

For Windows you can install Cygwin and remove all remote branches using following command:

git branch -r --merged | "C:\cygwin64\bin\grep.exe" -v master | "C:\cygwin64\bin\sed.exe" 's/origin\///' | "C:\cygwin64\bin\xargs.exe" -n 1 git push --delete origin

There is no command in Git that will do this for you automatically. But you can write a script that uses Git commands to give you what you need. This could be done in many ways depending on what branching model you are using.

If you need to know if a branch has been merged into master the following command will yield no output if myTopicBranch has been merged (i.e. you can delete it)

$ git rev-list master | grep $(git rev-parse myTopicBranch)

You could use the Git branch command and parse out all branches in Bash and do a for loop over all branches. In this loop you check with above command if you can delete the branch or not.

You can use gbda alias if you're using OhMyZSH with git plugin.

If you wish to delete local branches that have been merged as well as delete their remotes here's the one-liner I prefer:

git branch --merged | xargs -I_br -- sh -c 'git branch -d _br; git push origin --delete _br'

I use a git-flow esque naming scheme, so this works very safely for me:

git branch --merged | grep -e "^\s\+\(fix\|feature\)/" | xargs git branch -d

It basically looks for merged commits that start with either string fix/ or feature/.

The accepted solution is pretty good, but has the one issue that it also deletes local branches that were not yet merged into a remote.

If you look at the output of you will see something like

$ git branch --merged master -v
  api_doc                  3a05427 [gone] Start of describing the Java API
  bla                      52e080a Update wording.
  branch-1.0               32f1a72 [maven-release-plugin] prepare release 1.0.1
  initial_proposal         6e59fb0 [gone] Original proposal, converted to AsciiDoc.
  issue_248                be2ba3c Skip unit-for-type checking. This needs more work. (#254)
  master                   be2ba3c Skip unit-for-type checking. This needs more work. (#254)

Branches bla and issue_248 are local branches that would be deleted silently.

But you can also see the word [gone], which indicate branches that had been pushed to a remote (which is now gone) and thus denote branches can be deleted.

The original answer can thus be changed to (split into multiline for shorter line length)

git branch --merged master -v | \
     grep  "\\[gone\\]" | \
     sed -e 's/^..//' -e 's/\S* .*//' | \
      xargs git branch -d

to protect the not yet merged branches. Also the grepping for master to protect it, is not needed, as this has a remote at origin and does not show up as gone.

This also works to delete all merged branches except master.

git branch --merged | grep -v '^* master$' | grep -v '^  master$' | xargs git branch -d

Windoze-friendly Python script (because git-sweep choked on Wesnoth repository):

#!/usr/bin/env python
# Remove merged git branches. Cross-platform way to execute:
#
#   git branch --merged | grep -v master | xargs git branch -d
#
# Requires gitapi - https://bitbucket.org/haard/gitapi
# License: Public Domain

import gitapi

repo = gitapi.Repo('.')
output = repo.git_command('branch', '--merged').strip()
for branch in output.split('\n'):
  branch = branch.strip()
  if branch.strip(' *') != 'master':
    print(repo.git_command('branch', '-d', branch).strip())

https://gist.github.com/techtonik/b3f0d4b9a56dbacb3afc