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MPE/iX, Multiprogramming Executive with Integrated POSIX, is the latest
in a series of forward-compatible operating systems for the HP 3000
line of computers. In HP documentation and in talking with HP 3000 users, you will
encounter references to MPE XL, the direct predecessor of MPE/iX.
MPE/iX is a superset of MPE XL. All programs written for MPE XL
will run without change under MPE/iX. You can continue to use MPE XL
system documentation, although it may not refer to features added to
the operating system to support POSIX (for example, hierarchical
directories). Finally, you may encounter references to MPE V, which is the operating
system for HP 3000s, not based on PA-RISC architecture. MPE V
software can be run on the PA-RISC (Series 900) HP 3000s in what
is known as compatibility mode. This manual provides a programmer's view of the command interpreter (CI) and its programming capabilities. Through command files and user-defined commands (UDCs), the programmer can develop scripts to accomplish many system-oriented tasks simply and efficiently. This manual presents these capabilities and examples of their use in the following sequence: Chapter 1, "Introduction," describes the CI and how it is viewed by all system users. It further describes the unique attributes that make it especially useful to programmers. Chapter 2, "Accessing the Command Interpreter," presents the various methods of invoking commands. It describes command files and UDCs in detail. Chapter 3, "Setting and Manipulating Variables," describes user-defined variables and predefined variables. It details the methods of setting and modifying any variable, as well as creating, naming, and deleting user-defined variables. Chapter 4, "Evaluating Expressions," describes the expression evaluator and its numerous functions. It provides examples of performing arithmetic and bit operations, and evaluating strings and file characteristics. Chapter 5, "Using Language Constructs Available with the CI," presents key functions that provide variations in receiving input and delivering output. It provides the basis for conditional branching and looping structures. Chapter 6, "Accessing Variables and CI Commands in Applications," describes the intrinsics that provide communication between application programs and built-in CI commands, command files, and UDCs. Chapter 7, "Sample Command Files," provides samples of actual command files offer suggested uses of many of the CI functions. A short description of each points out some of the key processing techniques that can be accomplished with the CI. Chapter 8, "Command Input/Output Redirection (CIOR)," describes how to define different files for command input and command output. Two appendixes provide lists of commonly used predefined variables and evaluator functions. Detailed explanations of all predefined variables, evaluator functions, and CI commands can be found in the MPE/iX Commands Reference Manual (32650-90003).
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