HP 3000 Manuals HP 3000 Manuals
Chapter 5 Variables A new feature of MPE XL is the availability of two kinds of variables. Now, users can create and assign values to variables. Predefined system variables also are available. Together they extend the programming-like capabilities of the command interpreter. User created variables are new tools for both interactive and programmatic use. They are similar to MPE V/E job control words (JCWs) but are more versatile. The lessons on user created variables introduce the new commands SETVAR, SHOWVAR, and DELETEVAR. * Lesson 1: Names for user created variables * Lesson 2: Creating and displaying variables * Lesson 3: Deleting a variable System variables give the user greater access to global items. Some are user modifiable. The lessons on system variables describe the new commands SETVAR and SHOWVAR. * Lesson 4: System variables * Lesson 5: User modifiable system variables * Lesson 6: Modifying and restoring system values Two new commands, ECHO and INPUT, offer the user some helpful options for both kinds of variables. * Lesson 7: The ECHO command * Lesson 8: Using INPUT to change your prompt Aspects of dereferencing and some simple variable applications furnish the user with more choices in MPE XL. * Lesson 9: Dereferencing variables * Lesson 10: Dereferencing with SETVAR * Lesson 11: Changing your search path