Check if file contains string

Question

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 tru

Answer 1

Grep will give you an array of all found 'monitor's. But you don't want an array, you want a boolean: is there any 'monitor' string in this file? This one reads as little of the file as needed:

if File.open('test.txt').lines.any?{|line| line.include?('monitor')}
  p 'do something'
end

readlines reads the whole file, lines returns an enumerator which does it line by line.