Normally I have a hoarding problem with branches that have been merged but this one-liner makes it easy to tidy up commits that are following any kind of naming convention.
1git branch --list | grep <branch expression> | xargs git branch -d
Encapsulating this into a utility shell script...
1#!/bin/bash
2
3if [ $# -lt 1 ] || [ $# -gt 2 ]
4then
5 echo "Usage: $0 <branch prefix> [force flag]"
6 exit 1
7fi
8
9PREFIX=$1
10FORCE=$2
11
12if [ "$FORCE" == "force" ]
13then
14 git branch --list | grep "$PREFIX" | xargs git branch -D
15else
16 git branch --list | grep "$PREFIX" | xargs git branch -d
17fi