1  Command_Recall
   Oracle Rdb saves and allows you to access up to 20 of your most
   recently entered RDO commands. Use the UP-ARROW or CTRL/B keys
   to recall previously entered commands. Use the DOWN-ARROW key
   to reexamine a command that you had retrieved using the UP-ARROW
   key.

   This feature is designed for the convenience of RDO users. It
   greatly reduces the need to enter the RDO editing buffer to
   rerun one or more of your last 20 commands. The EDIT statement
   continues to be a useful tool for created RDO procedures in that
   it lets you take advantage of your editor's text manipulation
   features and it lets you edit multiple lines.
 

2  More
   Any string entered at the RDO> prompt is saved in the recall
   buffer. This includes all DCL commands prefaced by the dollar
   sign ($), commented text that begins with the exclamation
   point (!), and any RDO statements. The carriage return delimits
   each line written to the recall buffer. Thus, in the following
   example, four separate entries are written to the recall buffer:

   RDO> FOR E IN EMPLOYEES
   cont> WITH E.EMPLOYEE_ID BETWEEN "00164" AND "00175"
   cont> PRINT E.LAST_NAME, E.EMPLOYEE_ID
   cont> END_FOR

   The most recently typed command is at the top of the recall
   buffer. If the user enters CTRL/B at this point, the END_FOR
   statement would appear first.

   There are no parameters or logicals available to control the
   maximum number of lines saved in the recall buffer.