interpolation.rb

interp = 'blah blah'

text = "something \n something #{interp}"
puts text  #=> "something \n something blah blah"

text = 'something \n something #{interp}'
puts text  #=> "something \\n something \#{interp}"

text = %Q{something \n something #{interp}}
puts text  #=> "something \n something blah blah"

text = %q{something \n something #{interp}}
puts text  #=> "something \\n something \#{interp}"

~output.txt

something
 something blah blah
something \n something #{interp}
something
 something blah blah
something \n something #{interp}