Delete Git Branch except...

delete_branch_except.sh

#!/bin/bash

if [ -z "$1" ]; then
  echo "Usage: $0 [branch-1,branch-2,...]"
  exit 1
fi

# Convert input string into array
IFS=',' read -ra KEEP_BRANCHES <<< "$1"

# Convert array to grep pattern
KEEP_PATTERN=$(printf "|^%s$" "${KEEP_BRANCHES[@]}")
KEEP_PATTERN="${KEEP_PATTERN:1}" # remove leading |

# Get list of local branches
ALL_BRANCHES=$(git branch --format="%(refname:short)")

# Filter branches to delete
BRANCHES_TO_DELETE=$(echo "$ALL_BRANCHES" | grep -vE "$KEEP_PATTERN")

# Confirmation prompt
echo "Branches to delete:"
echo "$BRANCHES_TO_DELETE"
echo
read -p "Are you sure you want to delete these branches? (y/N): " confirm
if [[ ! "$confirm" =~ ^[Yy]$ ]]; then
  echo "Aborted."
  exit 0
fi

# Delete branches
echo "$BRANCHES_TO_DELETE" | xargs -n 1 git branch -D