A simple script that deletes Git Branches older than specific days

clean_git_branches.sh

#!/bin/bash

PWD=$(pwd)
DAYS_THRESHOLD=5

# Check if in Git Repository
if [ ! "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = "true" ]; then
  echo "This is not a git repository!"
  exit 1
fi

# Get list of branches and make it an Array
BRANCHES="$(git branch --format='%(refname:short)')"
BRANCHES=(${BRANCHES//$'\n'/ })

# Loop through each branch and prompt user
for b in "${BRANCHES[@]}"
do
  
  # Get the last commit date from the branch git-log
  LAST_COMMIT_DATE=$(git log $b -1 --format="%cd" --date=iso)
  # Calculate its age in DAYS
  let DIFF=($(date +%s)-$(date +%s --date="$LAST_COMMIT_DATE"))/86400
  
  echo -e "- ${YELLOW} $b ${DARK_GRAY}($DIFF Days Old)${NC}"

  # Check threshold, get confirmation from User & delete!
  if [ "$DIFF" -gt "$DAYS_THRESHOLD" ]; then
    read -p "Delete ? " yn
    case $yn in

      [Yy]* )
        git branch -D $b
        echo ""
        ;;
      
      *)
        echo "Skipped"
        ;;

    esac
  fi
done