Delete all local Git branches

I follow a development process where I create a new local branch for every new feature or story card. When finished I merge the branch into master and then push.

What tends to happen over time due to a combination of laziness or forgetfulness, is that I end up with a large list of local branches, some of which (such as spikes) may not have been merged.

I know how to list all my local branches and I know how to remove a single branch but I was wondering if there was a Git command that allows me to delete all my local branches?

Below is the output of the git branch --merged command.

cd ~/projects/applicationgit branch --merged

Output:

  STORY-123-Short-Description  STORY-456-Another-Description  STORY-789-Blah-Blah* master

All attempts to delete branches listed with grep -v \* (as per the answers below) result in errors:

error: branch 'STORY-123-Short-Description' not found.error: branch 'STORY-456-Another-Description' not found.error: branch 'STORY-789-Blah-Blah' not found.

I'm using:

• Git 1.7.4.1
• Ubuntu 10.04 (Lucid Lynx)
• GNU Bash, version 4.1.5(1)-release
• GNU grep 2.5.4