title: Can I search/replace in multiple .txt files quickly from Terminal?
body: <p>I have about 100 .txt files that contain plain text. Somehow, some of the data has been corrupted and needs to be found/replaced.</p>
  
  <p>I need to search for the characters'--' and replace it with a long dash: '—'.</p>
  
  <p>Is there a way to do this quickly with a command in terminal?</p>
  
  <p>The names of the .txt files in my directory are numbered sequentially: 1.txt, 2.txt, etc.</p>
  
  <p>Thanks!</p>