Command Interpreter Access and Variables Programmer's Guide: Series HP 3000 Computer Systems

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HP Part Number: 32650-90493

Edition: Fourth Edition

Published: Printed in U.S.A. April 1994

Table of Contents

1 The user's interface to the operating system (MPE/iX) provides a flexible, productive environment for all users. The command interpreter (CI) is an integral part of this interface.

What Is the Command Interpreter?
How Is the Command Interpreter Used?
How Programmers Use the CI

2 Command images are routed to the CI through several different paths. You can issue CI commands in several ways:

Issuing Commands Directly

Reissuing and Modifying Commands

Issuing Commands Through UDCs

Creating a UDC File
Executing a UDC
Specifying UDC Options

Issuing Commands Through Command Files

Creating a Command File
Executing a Command File
Specifying Options for Command Files

Issuing Commands from an Application Program

Parameter Handling

ANYPARM

3 Setting and Manipulating Variables

Setting User-Defined Variables

Defining Variable Type
Displaying User-Defined Variables
Naming Variables
Deleting User-Defined Variables

Using Predefined Variables

Displaying Values
Modifying Values

Accessing Variable Values

Implicit Dereferencing
Explicit Dereferencing
Recursive Dereferencing

Substituting Strings

4 Evaluating Expressions

Using Expressions in CI Commands

Performing Arithmetic Operations
Evaluating Strings
Performing Bit Operations
Converting Numbers
Evaluating File Characteristics
Comparing Results

Expression Substitution

5 Using Language Constructs Available with CI

Obtaining Input

Identifying Parameters
Prompting for Input
Retrieving Input from a File

Branching After Evaluation

Creating Processing Loops

Reporting Results

Displaying Output to the Terminal
Redirecting Output to a File

Returning to Calling Environment

6 Accessing Variables and CI Commands in Applications

Using Intrinsics to Set Variables
Using Intrinsics to Retrieve Variables
Using Intrinsics to Execute CI Commands

7 Sample Command Files

To Center a String
To Set a Function Key
To Add User Capabilities
To Retrieve File Information
To Create a Calculator
To Create a Menu of Options
To List Multiple Files

8 Command Input/Output Redirection (CIOR)

Redirecting Command Input and Output

Redirecting Command Input
Redirecting Command Output
Redirecting Both Command Input and Output
Redirecting I/O with a File Backreference
Appending Redirected Command Output
Redirecting Output to a Device File

Stacked I/O Redirection

Things to Remember about Redirection Constructions

Escaping Redirection

Redirection File Defaults

Determining Redirection: HPSTDIN and HPSTDLIST

A Predefined Variables

B Evaluator Functions

List of Figures

6-1 HPCIPUTVAR Intrinsic Example
6-2 HPCIGETVAR Intrinsic Example
7-1 Center Command File
7-2 Center Command File with the Repeat Function
7-3 Function Key Command File
7-4 FKEY Sample Output
7-5 Additional Capability Command File
7-6 ADDCAP Sample Output
7-7 File Information Command File
7-8 FILINFO Sample Output
7-9 Calculator Command File
7-10 Menu Command File
7-11 List Command File

List of Tables

4-1 FIFO Specifications
A-1 Predefined Variables
B-1 Expression Evalua0tor Functions


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