title: cannot move <filename> to <foldername>: permission denied
body: <p>I am attempting to move all files from one folder to another by using command:
  <code>mv folder1name/* folder2name</code>.
  However, it gives the error <code>cannot move 'filename' to 'folder2name': permission denied.</code>
  I saw a video where someone used <code>sudo</code> beforehand, but I still get the same error when I try that.
  I'm sure I'm missing something simple and subtle, but I can't seem to find exactly what I need.</p>