Running another ruby script from a ruby script

by 
require "b.rb"

will execute the contents of b.rb (you call leave off the “.rb”, and there is a search path). In your case, you would probably do something like:

a.rb:

require "b.rb";
b("Hello", "world")

b.rb:

def b(first, second)
  puts first + ", " + second
end

Note that if you use require, Ruby will only load and execute the file once (every time you call load it will be reloaded), but you can call methods defined in the file as many times as you want.

As things get more complex, you will want to move towards an object-oriented design.

EDIT: In that case, you should look into Ruby threading. A simple example is:

a.rb:

require "b";
t1 = Thread.new{b("Hello", "world");}
t2 = Thread.new{b("Hello", "galaxy");}
t1.join
t2.join

b.rb:

def b(first, second)
  10.times {
    puts first + ", " + second;
    sleep(0.1);
  }
end

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