= Line number display

        NUM {on | off | xon | xoff | seti | setr
            (nn) | reset | renum | clear | ?} [s|f|k]
        REN [{setr|seti} [col1[-col2] ['delmchar'|S|B]]]

             on      :display 7 digits line number.
                     line number format is nnnnmmm
                                          nnnn:line number at open
                                          mmm :post-fix by line insert
                      nnnnnmm format if file contain over   10,000 lines
                      nnnnnnm format if file contain over  100,000 lines
                      nnnnnnn format if file contain over 1000,000 lines
            off     :no line number field displayed
            (nn)    :number of line number digit
                     only line update flag is displayed if 0;
                     no post-fix if 1 through 4(5 for over 10,000 line).
                     post-fix is from top digit when 5 or 6.
                     7 is same meaning as on.
             (note).Change is applied to screen of current and opened
                    after this time.
                   .Line number digit is ajusted for each file at open
                    when this default value is too small.
                   .value is hold for browse/edit/cmd output screen each.
                   .For line-numbered file,7 is user at each open time
                    regardless this setting.

            xon/xoff:Attr of line number column display, offset or lineno.
            s       :Change default value for binary file.
                     (for text file default is always line number type).
            reset/renum:re-number line-number.(reset sub line number to 0)
                        For SPF(line-numbered) file,all line length is set to
                        the fixed length,and line number column is set.
                        renum set on col 1-6 for COBOL file.
            clear   :space clear line number field.
            f       :force re-number for line-numbered file with error
                     of line-no or line-length.
            k       :clear/renum col 1-6 of cobk type file.
            ?       :display current default value for browse/edit/
                     command output screen.

            SETR/SETI :set line number into the file area by insert or replace mode.
            col1,col2 :column position to set.
                       field width is specified up to 8 byte by col2.
                       same width as left most line number column
                       if col2 is not specified.
            delmchar  :delimiter inserted after line number.
                       enclose by quotation or use S or B for space.
            ex) ren seti 12'|' ,  ren setr 1-8: