title: Exit/save edit to sudoers file? Putty SSH
body: <p>Been following instructions for editing sudoers file, made changes but the instructions say to exit using ctrl+x - this just gives me a capital X and a caret. Have tried ctrl:x ctrl+Q Esc.</p>
  
  <p>Not using nano or any other gui (just putty terminal), the change I am trying to save is to set nano as default editor.</p>
  
  <p>I just need to know which keys do I press and in which order?</p>
  
  <p>Also as a side question are there any 'good' linux tutorial sites, I seem to trawl for hours trying to find the simplest answers? 'Good' as in explained well and without omitting vital info (like which gui you are using).</p>