Delete Old Git Branches on Mac using Zsh Shell Script

delete_old_branches.sh

#!/bin/zsh

# Put this script in your git repo: /Users/yourusername/yourrepo/delete_old_branches.sh
# Create a text file called old_branches.txt, put this in your repo as well: /Users/yourusername/yourrepo/old_branches.txt
# In old_branches.txt, put the names of the branches you want to delete. 1 Branch name per line, no commas.
# Then run...

# cd /Users/yourusername/yourrepo
# chmod 755 delete_old_branches.sh
# git config --global --add safe.directory /Users/yourusername/yourrepo
# sudo ./delete_old_branches.sh

cat "old_branches.txt" | { cat ; echo ; } | 
while read line; do 
        # If you want to delete these branches on the remote server as well, uncomment out the line below
	# push origin --delete $line;
	git branch -D $line;
done