Parse command line : gets « Development « Ruby

1. Ruby
2. Development
3. gets

Parse command line

filename = nil
lines = 0               # Default means no truncating

loop do
  begin
    opt, arg = gets
    break if not opt
    case opt
      when "-h"
        puts "Usage: ..."
        break           # Stop processing if -h
      when "-f"
        filename = arg  # Save the file argument
      when "-l"
        if arg != ""
          lines = arg   # Save lines arg (if given)
        else
          lines = 100   # Default for truncating
        end
    end

  rescue => err
    puts err
    break
  end
end

puts "filename = #{filename}"
puts "lines    = #{lines}"

 

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