So I found this question on here, but I'm having an issue with the output and how to handle it with an if statement. This is what I have, but it's always saying that it's true even if the word monitor does not exist in the file

```
if File.readlines("testfile.txt").grep(/monitor/)
  do something
end

```

Should it be something like == "nil"? I'm quite new to ruby and not sure of what the outputs would be.