Delete all local git branches

The 'git branch -d' subcommand can delete more than one branch. So, simplifying @sblom's answer but adding a critical xargs:

git branch -D `git branch --merged | grep -v \* | xargs`

or, further simplified to:

git branch --merged | grep -v \* | xargs git branch -D

Importantly, as noted by @AndrewC, using git branch for scripting is discouraged. To avoid it use something like:

git for-each-ref --format '%(refname:short)' refs/heads | grep -v "master\|main" | xargs git branch -D

Caution warranted on deletes!

$ mkdir br
$ cd br; git init
Initialized empty Git repository in /Users/ebg/test/br/.git/
$ touch README; git add README; git commit -m 'First commit'
[master (root-commit) 1d738b5] First commit
 0 files changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 README
$ git branch Story-123-a
$ git branch Story-123-b
$ git branch Story-123-c
$ git branch --merged
  Story-123-a
  Story-123-b
  Story-123-c
* master
$ git branch --merged | grep -v \* | xargs
Story-123-a Story-123-b Story-123-c
$ git branch --merged | grep -v \* | xargs git branch -D
Deleted branch Story-123-a (was 1d738b5).
Deleted branch Story-123-b (was 1d738b5).
Deleted branch Story-123-c (was 1d738b5).

I found a nicer way in a comment on this issue on github:

git branch --merged master --no-color | grep -v "master\|stable\|main" | xargs git branch -d

Edit: Added no-color option and excluding of stable branch (add other branches as needed in your case)

The simpler way to delete all branches but keeping others like "develop" and "master" is the following:

git branch | grep -v "develop" | grep -v "master" | xargs git branch -D

very useful !

Delete all local git branches

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