What is the method to retrieve a variable that has been specified in a Ruby file that has been required in IRB?

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To retrieve a variable that has been specified in a Ruby file that has been required in IRB, you can simply call the variable name in IRB. For example, if you have required a file called "example.rb" that defines a variable called "my_variable", you can retrieve it in IRB by typing:

require './example.rb'
my_variable

This will output the value of the variable in the IRB console.