WHAT LINE
  Shows the current line number, total number of lines in the buffer, and
  percentage of that position in the buffer.
  Example:
     The following example shows the output from WHAT LINE, which is
     displayed in the message window at the bottom of the EVE screen:
        Command: WHAT LINE
        You are on line 35 out of 45 (78%).
  Usage notes:
  o  WHAT LINE is useful if you want to know whether to insert a page break
     or simply to find out how many lines are in the buffer.
  o  To go to a particular line by number, use the LINE command. For
     example, the command LINE 10 moves the cursor to the start of line 10
     in the current buffer.
  Related topics:
     LINE    MOVE BY LINE    SHOW