MPE/iX - CI Programming for Stability

July 18, 2008 HP World '01 5
UDCs
• User Defined Command files (UDCs) - a single file
that contains 1 or more command definitions, separated by
a row of asterisks (***)
• Features:
• simple way to execute several commands via one command
• allow built-in MPE commands to be overridden
• can be invoked each time the user logs on
• require lock and (read or eXecute) access to the file
• cataloged (defined to the system) for easy viewing and
prevention of accidental deletion -- see SETCATALOG and
SHOWCATALOG commands
• can be defined for each user or account or at the system level
• more difficult to modify since file is usually opened by users