blog-bargs-usageoutput1.md

• Using the help flag

  bash example.sh -h
  
  Usage: bash example.sh -n Willy --gender male -a 99
  
        --person_name  |  -n  [Willy]              What is your name?
        --age          |  -a  [Required]
        --gender       |  -g  [Required]
        --location     |  -l  [chocolate-factory]  insert your location

• Using default values

  $ bash example.sh -a 99 --gender male
  
  Name:      Willy
  Age:       99
  Gender:    male
  Location:  chocolate-factory

• Providing all arguments

  $ bash example.sh -a 23 --gender male -l neverland -n meir
  
  Name:      meir
  Age:       23
  Gender:    male
  Location:  neverland

• Providing an empty required argument

  $ bash example.sh -a 99 --gender
  
  [ERROR] Empty argument: gender
  
  Usage: bash example.sh -n Willy --gender male -a 99
  
        --person_name  |  -n  [Willy]              What is your name?
        --age          |  -a  [Required]
        --gender       |  -g  [Required]
        --location     |  -l  [chocolate-factory]  insert your location

• Providing an unknown argument

  $ bash example.sh -a 99 -u meir
  
  [ERROR] Unknown argument: -u
  
  Usage: bash example.sh -n Willy --gender male -a 99
  
        --person_name  |  -n  [Willy]              What is your name?
        --age          |  -a  [Required]
        --gender       |  -g  [Required]
        --location     |  -l  [chocolate-factory]  insert your location