git-rimraf : delete branches that don't exist on remote

git-rimraf

#!/bin/bash

git fetch -p && (git for-each-ref --format='%(if:equals=[gone])%(upstream:track)%(then)%(refname:short)%(end)' refs/heads; git for-each-ref --format "%(refname:short) %(upstream)" refs/heads | awk '{if (!$2) print $1;}') | grep -E -v 'master|main|develop' | xargs echo git branch -D

# explanation
# - `git fetch -p` : fetch branches that no longer exist on remote
# - `git for-each-ref --format='%(if:equals=[gone])%(upstream:track)%(then)%(refname:short)%(end)' refs/heads` : list all branches that no longer exist on remote
# - `git for-each-ref --format "%(refname:short) %(upstream)" refs/heads | awk '{if (!$2) print $1;}'` : list all branches without a remote
# - `grep -E -v 'master|main|develop'` : remove master, main, develop branches from the results
# - `xargs echo git branch -D` : print the commande to delete those branches (remove echo if you want to exec this command directly)