Changes

* The <span style="color:blue;font-weight:bold">'''ls</span> ''' command displays a listing of filenames in the current directory* The <span style="color:blue;font-weight:bold">'''ls /bin</span> ''' command displays a listing of filenames in the /bin directory (as opposed to your current directory)* The <span style="color:blue;font-weight:bold">'''ls -l</span> ''' command displays a detailed listing of filenames in the current directory* The <span style="color:blue;font-weight:bold">'''ls -l /bin</span> ''' command displays a details listing of files in the /bin directory