[SOLVED] How to add a command to a ruby script for terminal in Kali linux?

Issue

Noob question, but how do I add a command in a ruby script for the terminal?

for example ruby tool.rb and I want to add a command -c that will invoke a method that prints blah blah, and then execute it via the terminal in kali linux, so it would look something like this ruby tool.rb -c. Would anyone know how to do this and know what this is called?

Solution

That's called running a ruby script/program from the command line and passing "flags" like -c are passed to the script as command line arguments and are an array of string values separated by spaces normally.

Here's your very simple script:

tool.rb

#!/usr/bin/env ruby

if ARGV[0] == '-c'
  puts 'blah blah'
end

You can run this from the command line exactly as you requested.

ruby tool.rb -c

Updated

If you need additional arguments or want to pass something else to your flag you can do as I mentioned ARGV is an array constructed from string passed after the name of your ruby script so:

#!/usr/bin/env ruby

if ARGV[0] == '-c'
  puts "blah blah #{ARGV[1]}" # array items are called by index
end

So if you do this:

ruby tool.rb -c foo

You will get:

blah blah foo

Answered By - lacostenycoder

Answer Checked By - Mildred Charles (WPSolving Admin)