Set ALB Listener Rule Priority Helper

#!/bin/bash

function usage()
{
    echo "Usage: $0 [options] [--]
    Options:
    -h|help              Display this message
    -r|region            AWS Region
    -n|loadbalancername  Load balancer name
    -p|pathpattern       Path pattern"
}



while getopts ":hr:n:p:" opt;
do
  case ${opt} in
    h|help ) usage; exit 0 ;;
    r|region ) REGION=$OPTARG ;;
    n|loadbalancername ) LBNAME=$OPTARG ;;
    p|pathpattern ) PATHPATTERN=$OPTARG ;;
    * )  echo -e "\n  Option does not exist : $OPTARG\n"
          usage; exit 1   ;;
  esac
done
shift $(($OPTIND-1))

if [ -z $REGION ] || [ -z $LBNAME ] || [ -z $PATHPATTERN ]; then
    usage
    exit 1
fi

LBARN=`aws elbv2 describe-load-balancers --region $REGION --name $LBNAME --output json | jq -r .LoadBalancers[0].LoadBalancerArn`
echo "Process Load balancer $LBARN"

LBLISTENERs=`aws elbv2 describe-listeners --load-balancer-arn $LBARN --output json | jq -r .Listeners[].ListenerArn`
for listener in $LBLISTENERs
do
    echo "Go through listener: $listener"
    RULEs=`aws elbv2 describe-rules --listener-arn $listener --output json | jq -r .Rules[].RuleArn`
    for rule in $RULEs
    do
        PATH_PATTERN_VAL=`aws elbv2 describe-rules --rule-arns $rule --output json | jq -r .Rules[0].Conditions[0].Values[0]`
        if [ $PATH_PATTERN_VAL == $PATHPATTERN ]; then
            echo "Found a rule matched the pattern"
            echo "ARN, Priority and Pattern as follow,"
            aws elbv2 describe-rules --rule-arns $rule --output json | jq -r ".Rules[0] | .RuleArn, .Priority, .Conditions "
            FIRST_RULE_ARN=`aws elbv2 describe-rules --listener-arn $listener --output json | jq -r ".Rules | sort_by(.Priority | tonumber? // .) | .[0].RuleArn "`
            FIRST_RULE_PRIORITY=`aws elbv2 describe-rules --rule-arns $FIRST_RULE_ARN --output json | jq -r ".Rules[0].Priority"`
            echo "The current listenr highest prority rule is $FIRST_RULE_ARN with the priority $FIRST_RULE_PRIORITY"
            echo "You can change/set the Priority of $rule by, "
            echo ""
            echo "   aws elbv2 set-rule-priorities --rule-priorites  RuleArn=$rule,Priority=<number_less_than_$FIRST_RULE_PRIORITY>"
            echo ""
        fi
    done
done