Tips! Gérer les paramètres d’un script Shell

#!/bin/bash
#set -x

QUIET=1
CURRENT_PRICE=""

POSITIONAL_ARGS=()

function usage() {
  echo "Usage: $0 [--quiet] [--aws-profile <my_aws_profile>] [--aws-bucket <my-aws-bucket>] [--airport <airport_id>] [--departure-date <date_slash>] [-departure-time <time_colon>] [--return-date <date_slash>] [--return-time <time_colon>] [--cars <cars_comma>] [--ntfy-token <ntfy_token>]"
}

while [[ $# -gt 0 ]]; do
  case $1 in
    -profile|--aws-profile)
      AWS_PROFILE="$2"
      shift # past argument
      shift # past value
      ;;
    -bucket|--aws-bucket)
      AWS_BUCKET="$2"
      shift # past argument
      shift # past value
      ;;
    -q|--quiet)
      QUIET=0
      shift # past argument
      ;;
    -ap|--airport)
      TRIP_AIRPORT="$2"
      shift # past argument
      shift # past value
      ;;
    -dd|--departure-date)
      TRIP_DEPARTURE_DATE="$2"
      shift # past argument
      shift # past value
      ;;
    -dt|--departure-time)
      TRIP_DEPARTURE_TIME="$2"
      shift # past argument
      shift # past value
      ;;
    -rd|--return-date)
      TRIP_RETURN_DATE="$2"
      shift # past argument
      shift # past value
      ;;
    -rt|--return-time)
      TRIP_RETURN_TIME="$2"
      shift # past argument
      shift # past value
      ;;
    -ca|--cars)
      IFS=',' read -r -a CARS <<< "$2"
      shift # past argument
      shift # past value
      ;;
    -cp|--current-price)
      CURRENT_PRICE="$2"
      shift # past argument
      shift # past value
      ;;
    -ntfy|--ntfy-token)
      NTFY_TOKEN="$2"
      shift # past argument
      shift # past value
      ;;
    -*|--*)
      echo "Unknown option $1"
      exit 1
      ;;
    *)
      POSITIONAL_ARGS+=("$1") # save positional arg
      shift # past argument
      ;;
  esac
done

set -- "${POSITIONAL_ARGS[@]}" # restore positional parameters

MISSING_ARGS_FLAG=1
MISSING_ARGS_TEXT="Error: Missing parameters:\n"
if [ -z "${AWS_PROFILE}" ]; then
  MISSING_ARGS_TEXT="${MISSING_ARGS_TEXT} - AWS Profile\n"
  MISSING_ARGS_FLAG=0
fi
if [ -z "${AWS_BUCKET}" ]; then
  MISSING_ARGS_TEXT="${MISSING_ARGS_TEXT} - AWS Bucket\n"
  MISSING_ARGS_FLAG=0
fi
if [ -z "${TRIP_AIRPORT}" ]; then
  MISSING_ARGS_TEXT="${MISSING_ARGS_TEXT} - Airport code\n"
  MISSING_ARGS_FLAG=0
fi
if [ -z "${TRIP_DEPARTURE_DATE}" ]; then
  MISSING_ARGS_TEXT="${MISSING_ARGS_TEXT} - Departure date\n"
  MISSING_ARGS_FLAG=0
fi
if [ -z "${TRIP_DEPARTURE_TIME}" ]; then
  MISSING_ARGS_TEXT="${MISSING_ARGS_TEXT} - Departure time\n"
  MISSING_ARGS_FLAG=0
fi
if [ -z "${TRIP_RETURN_DATE}" ]; then
  MISSING_ARGS_TEXT="${MISSING_ARGS_TEXT} - Return date\n"
  MISSING_ARGS_FLAG=0
fi
if [ -z "${TRIP_RETURN_TIME}" ]; then
  MISSING_ARGS_TEXT="${MISSING_ARGS_TEXT} - Return time\n"
  MISSING_ARGS_FLAG=0
fi
if [ -z "${CARS}" ]; then
  MISSING_ARGS_TEXT="${MISSING_ARGS_TEXT} - Cars\n"
  MISSING_ARGS_FLAG=0
fi
if [ ${MISSING_ARGS_FLAG} -eq 0 ]; then
  echo -e "${MISSING_ARGS_TEXT}"
  usage
  exit 1
fi