How to delete a ton (lot) of remote (gitlab) branches

• Create a text file, call it branches.txt (with branches one per line)

branch1
branch2
branch3

• Create a shell file, call it delete.sh

#!/bin/bash
while IFS='' read -r line || [[ -n "$line" ]]; do
  echo "Deleting branch: $line"
  git push origin --delete $line
done < "$1"

• chmod the file to make it executable

chmod 0700 delete.sh

• Make sure both of these files are on the repo, meaning it should be on the root directory of your local git repo
• Run this command, and sit back and relax while the magic happens:-

./delete.sh branches.txt