title: Read string from file and convert into an int
body: <p>I have a txt file with ONLY a number inside; it can be any number, how can i read it from bash and convert it into an int?</p>
  
  <p>As i said, the only thing in the file is the number, no other thing, but when reading it, bash gets it as a string.</p>
  
  <p>Thanks in advance!</p>