devops-exercises/exercises/shell/solutions/num_of_args.md

Number of Arguments

Objectives

• Write a script that will print "Got it: " in case of one argument
• In case no arguments were provided, it will print "Usage: ./ "
• In case of more than one argument, print "hey hey...too many!"

Solution

#!/usr/bin/env bash

set -eu

main() {
  case $# in
    0) printf "%s" "Usage: ./<program name> <argument>"; return 1 ;;
    1) printf "%s" "Got it: $1"; return 0 ;;
    *) return 1 ;;
  esac
}

main "$@"