Checks the available git branches and deletes all branches that are fully merged in the main branch.

deletemergedbranches.sh

#!/bin/bash -e

# Checks the available git branches and deletes all branches that are fully
# merged in the main branch.
#
# Source: http://devblog.springest.com/a-script-to-remove-old-git-branches

# Configuration
if [ -z ${MAIN_BRANCH} ]; then
  MAIN_BRANCH=develop
fi

if [ -z ${REMOTE} ]; then
  REMOTE=origin
fi

# Run this from the main branch.
git checkout "${MAIN_BRANCH}"

# Update our list of remotes.
git fetch
git remote prune ${REMOTE}

# Remove local fully merged branches, except the main branch and any detached branches.
git branch --merged "${REMOTE}/${MAIN_BRANCH}" | grep -v "^[( |*)] ${MAIN_BRANCH}$" | grep -v "(HEAD detached at [0-9a-f]*)" | xargs --no-run-if-empty git branch -d

# Show remote fully merged branches.
echo "The following remote branches are fully merged and will be removed:"
MERGED_BRANCHES=$(git branch -r --merged "${REMOTE}/${MAIN_BRANCH}" | grep "^  ${REMOTE}\/" | sed "s/  ${REMOTE}\///" | grep -v "^${MAIN_BRANCH}$" | grep -v "^master$")
echo "$MERGED_BRANCHES"

read -p "Continue (y/n)? "
if [ "${REPLY}" == "y" ]
then
   # Remove remote fully merged branches.
   echo "$MERGED_BRANCHES" | xargs --no-run-if-empty -I% git push ${REMOTE} :%
   echo "Done!"
   echo "Obsolete branches are removed"
fi