Retro1.org codex

$DUP                                                        CMS EDIT subcommand

Use the $DUP to duplicate the current line.  The format of the $DUP macro is:
+----------+------------------------------------------------------------------+
| $DUP     | [1|n]                                                            |
+----------+------------------------------------------------------------------+
where:

n        indicates the number of times you want to duplicate the line; the
         maximum value you can specify is 25.  If n is omitted, the current
         line is duplicated once.


Usage Notes:

1.  The last copy of the line duplicated becomes the new current line.

2.  If you use the logical line end symbol (#) to stack additional subcommands
    on the same line with the $DUP edit macro those subcommands are cleared
    from the console stack and the message:
       STACKED LINES CLEARED BY $DUP
    is issued.  The stacked subcommand(s) are not executed.

3.  Because it uses console functions, $DUP cannot be used when duplicating
    records containing binary zeros or nonprintable characters.  Truncated
    duplicate records will result.

4.  When using line-number editing, you can insert duplicate lines between
    existing numbered lines if the interval between line numbers is large
    enough.  Execution of $DUP stops after the last valid line number has been
    assigned.  You can renumber your file to increase the interval between line
    numbers.

5.  Because it uses the STACK EDIT subcommand, $DUP can duplicate a maximum of
    130 characters in one line.  Longer lines are truncated.

Responses:

The last line duplicated (the new current line) is displayed.