Script to delete branches older than a certain date

delete_branches_older_than.sh

#!/bin/bash

dry_run=0

usage()
{
cat << EOF
usage: $0 [-n] ["string_to_date"]

Remove branches older than specified, human-readable date passed as a param

Date example: "yesterday", "6 months ago"

OPTIONS:
   -n      dry-run, don't delete anything just list commands
   -h      display this help message
EOF
}

if [ -z "$1" ]; then
    usage
    exit 3
fi

while getopts “n” OPTION
do
     case $OPTION in
         n)
             dry_run=1
             ;;
         ?)
             usage
             exit 1
             ;;
     esac
done

shift $((OPTIND-1))

date="$1"

if [ -z "$date" ]; then
    usage
    exit 2
fi

for branch in $(git branch -a | grep origin | grep -vE '(HEAD|master$)' | sed 's/^\s*//' | sed 's/^remotes\///'); do
    if [[ "$(git log $branch --since "$date" | wc -l)" -eq 0 ]]; then
        if [[ "$branch" =~ "origin/" ]]; then
            local_branch_name=$(echo "$branch" | sed -E 's/^(remotes\/)?origin\///')
            if [[ "$dry_run" -eq 1 ]]; then
                echo -e $(git log -1 --pretty=format:"%cr" -- $local_branch_name)\\t"# git push origin :$local_branch_name"
            else
                 git push origin :$local_branch_name
            fi
        else
            if [[ "$dry_run" -eq 1 ]]; then
                echo -e $(git log -1 --pretty=format:"%cr" -- "$branch")\\t"# git branch -D $branch"
            else
                git branch -D $branch
            fi
        fi
    fi
done