This is a walk-with-me-while-I-do-things series, I'm going to tell you what I learned while I'm learning
You can execute a Ruby file by passing it on as an argument to the
ruby. What if I told you you can require a library and give executable code directly to the command on the terminal?
ruby command supports two options among others:
-r stands for
require and receives as an argument the name of the Ruby file you want to load
-e stands for
execute and receives as an argument a script
Let's have a file in the current directory called
hello.rb that defines the Hello class like this:
class Hello def greet puts "Hello there!" end end
ruby -r "./hello" -e "h = Hello.new; h.greet"
the prompt will present you with the following output
You can even write a multiline script as if you were writing in a file
➜ first-repo git:(master) ✗ ruby -r "./hello" -e " dquote> h = Hello.new dquote> h.greet dquote> " Hello there!
Here is the documentation for all the options you can feed to the