Remove local branches except the master branch

Remove local branches except the master branch

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# DRY-RUN #
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# make sure you are on develop; one cannot ever delete the current branch
$ git checkout develop

# get references
$ git fetch

# fast forward (not merge) the current branch
$ git pull origin HEAD

# list every local branch (except 'develop' & 'master') that has already been merged with the local develop
$ git branch --merged develop | grep -vE 'develop|master'

# list stale references (like branches, tags, unreachable commits, etc)
$ git remote prune origin --dry-run

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# EXECUTE #
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# make sure you are on develop; one cannot ever delete the current branch
$ git checkout develop

# get references
$ git fetch

# fast forward (not merge) the current branch
$ git pull origin HEAD

# delete every local branch (except 'develop' & 'master') that has already been merged with the local develop
$ git branch --merged develop | grep -vE 'develop|master' | xargs git branch -d

# delete all stale tracking branches. 
$ git gc --prune=now

# de-reference stale references (like branches, tags, unreachable commits, etc)
$ git remote prune origin