title: `ls` exit status
body: <p>EDIT: nothing to see here!!!
  127 return means the command wasn't found - had to give an absolute path to the command for some reason :/ (I didn't delete in case someone else has this problem)</p>
  
  <p>Is there a reference of return statuses for common Linux functions like <code>ls</code>? (it doesn't seem to be in the man pages, at least for <code>ls</code>). If not, can someone tell me what <code>ls</code> returning 127 means?</p>