Ruby optparse
From wikinotes
Optparse is a basic commandline parser for ruby.
It is builtin to the standard library.
Documentation
official docs https://docs.ruby-lang.org/en/2.7.0/OptionParser.html
Example
require 'optparse' options = {} OptionParser.new do |opt| opt.on("-i", "--input FILE", "the input file") { |val| options[:input] = val } opt.on("-o", "--output FILE", "the output file") { |val| options[:output] = val } end.parse! return options if options.input && options.output STDERR.puts "[ERROR] requires -i/-o" exit(1)