1  RDO_Foreign_Cmd
   You can invoke RDO as a foreign DIGITAL Command Language (DCL)
   command. Example:

   $ RDO :== $RDO
   $ RDO CHANGE DATABASE FILE PERS JOURNAL FILE DSK1:[TOP]PS.AIJ.
 

2  More
   RDO as a foreign DCL command is useful in DCL command procedures
   because it lets you test the success or failure of the RDO DCL
   command line. For example, after each DCL command, you can enter
   in your procedure:

   $ IF $SEVERITY .NES. "1" THEN GOTO HANDLE_ERROR

   The integer values for each DCL severity level are:

   Value           Severity

   0               Warning
   1               Success
   2               Error
   3               Information
   4               Severe (fatal) error

   The possible integer values returned by RDO are 1, 2, or 4. The
   specific status codes returned by RDO are:

   SS$_NORMAL
   RDO-E-ERRDET, an error was detected
   RDO-F-SEVERRDET, a severe error was detected

   These are returned in DCL's $STATUS symbol.

   Users who currently invoke RDO as a foreign command will receive
   one of the above (as additional) messages if the RDO command
   fails. See the OpenVMS DCL Dictionary for more information about
   handling errors in DCL command procedures.