Suppose you want to run your rspec specs on various product environments & at run-time you want to mention where you would like the scripts to run, you can create a command line parameter say ENVIRONMENT and assign it a value like this :-
ENVIRONMENT= “dev” rspec spec/sanity_test_spec.rb
Similarly you can assign it values like prod, preproduction etc.
In your spec files you can retrieve the parameter value like this :-
runtime_param = ENV[‘ENVIRONMENT’]
puts “Evironment value got on runtime is #{runtime_param}”
The keyword ‘ENV’ is a built-in ruby term(I suppose) which handles this functionality.
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