VMS Help TCPIP Services, FTP, Command Procedures, Setting Error Level  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    To change the error level, you enter the following command where
    x is SUCCESS, WARNING, or ERROR:

    FTP> SET ERROR_LEVEL x

    o  If ERROR LEVEL is SUCCESS, then WARNING, ERROR, and FATAL will
       exit FTP.

    o  If ERROR LEVEL is WARNING, then ERROR and FATAL will exit FTP.

    o  If ERROR LEVEL is ERROR, then only FATAL will exit FTP.

    FATAL errors will always cause FTP to exit.