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Qshell for iSeries |
| Author: Fred A. Kulack | | Publisher: MC Press Online | | Publication Date: January 2004 | | Subject: Computer: Operating Systems |
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| | About this title |
Sometimes you hit a home run with a computer software book. This one is it. You don't have much choice when it comes to Qshell documentation, but now, it doesn't matter. This book is the only one you'll ever need if you want to learn about Qshell. But what is Qshell anyway? It is a UNIX-style shell and utilities command interface. Together, the shell and utilities provide a powerful scripting environment.
This book not only teaches you all about Qshell in an easier manner than the Qshell manual, but you'll also find things IBM never documented there. Qshell is a great program, but it will do much more for you than IBM will tell you, and this book gives you the scoop on that inside information.
The knowledge gleaned here will also be largely applicable to the shells for Linux and Unix, so programmers not familiar with those platforms will find those shells much easier to learn after learning Qshell. And leveraging your knowledge is what employee value is all about.
Ted Holt and IBMer Fred Kulack take you through Qshell and show you the ins and outs with more examples than you can imagine. Further, the book is written for people who will be using modern languages like C and Java as well as those who are more comfortable with DDS, CL and RPG. So whatever your angle on the iSeries is, this book is what you've been looking for.
So why should you care about Qshell?
First, Qshell is not an alternate interface to the others. Qshell includes commands that are not found in QCMD and iSeries Navigator. Second, Qshell is well suited for working with the Integrated File System (IFS). Third, Qshell can run shell scripts from Unix platforms with little or no modification, enabling programmers from Unix systems to do productive work on the iSeries. Fourth, Qshell handles multi-threaded programming. Fifth, Qshell is a good environment for the creation of Java applications.
This incredible Qshell resource will teach you:
- How to better manage IFS files in your applications
- How to run Unix or Linux shells on an iSeries
- How to implement Web/Java applications on an iSeries
- How to to run AIX binaries on your iSeries if your business uses a PASE environment
- How to automate your everyday, drudge work
- And much more!
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| About author |
Fred A. Kulack —
Fred Kulack is an IBM developer who has implemented portions of many of the UNIX-type API components on the iSeries. He has worked on Java and J2EE technologies such as JDBC, the Java Transaction API, and WebSphere and was part of the team that developed the Qshell interpreter. Fred now helps large IBM business partners with architecture, porting, and performance related to their C, C++, Java, and J2EE applications. He lives in Rochester, Minnesota.
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| Contents |
CONTENTS
Preface
Chapter 1: Introduction to Qshell
Unix and Linux Shells
Qshell
Summary
Chapter 2: Running Qshell
Qshell in an Interactive Job
Qshell in Batch Jobs
Redirecting Qshell Output
Summary
Chapter 3: The EDTF Text Editor
Starting EDTF
Introducing the Stream-File Exercises
Creating a New Stream File
Revising a Stream File
Summary
Chapter 4: Scripting
Naming a Script File
Running a Script File
Comments
The Magic Number
Executable Commands
Special Scripts
Your First Script
Summary
Chapter 5: Parameters and Variables, Defined
Command-Line Arguments
Retrieving Parameter Values
Special Parameters
Qshell Variables
Predefined Variables
Summary
Chapter 6: Using Parameters and Variables
Variable Expansion
Pattern Modifiers
Substrings
Substitution Expressions
Finding the Length of a Value
Concatenating Strings
Numeric Constants
Arithmetic Expressions
Summary
Chapter 7: The Exit Status and Decision-Making
Setting the Exit Status
The True, False, and Null Utilities
The If Command
The Test Utility
Conditional Execution
Looping Structures Governed by the Exit Status
Break and Continue
Summary
Chapter 8: Additional Control Structures
The For Loop
The Select Construct
The Case Construct
Summary
Chapter 9: The Integrated File System
Organization
Paths
Links
Displaying the Contents of IFS Files
Authority
Permissions
CCSIDs
Summary
Chapter 10: Input and Output
Standard Files
Redirection
The “Noclobber” Option
Pipes and Pipelines
Redirection Operators and Pipes
Tee
Overriding Redirection
“Here” Documents
Filters
I/O Utilities
File Descriptors
Summary
Chapter 11: Command-Line Arguments
Conventional Rules
Extracting Argument Values
Summary
Chapter 12: Commands
Regular and Special Built-in Utilities
Dual Implementations
Script Interpreters
External Utilities and the Magic Number
Aliases
Reserved Words
Functions
Simple and Compound Commands
The CMD Parameter
Processes
Locating Commands
Running Commands in the Background
Command Substitution
The Source (Dot) Utility
The Xargs Utility
The Exec Utility
Command Interpretation
The Eval Utility
Summary
Chapter 13: Functions
Function Syntax
Displaying Function Definitions
Deleting Function Definitions
Parameters
Variables
Invoking Functions
Return and the Exit Status
Retrieving Output from Functions
Summary
Chapter 14: Path-Name Expansion
Globbing
Preventing Globbing
When Globbing Fails
Summary
Chapter 15: Scripts—Debugging, Signals, and Traps
Debugging Using Option Settings
Signals
The Trap Utility
The Kill Utility
Summary
Chapter 16: Archives and Compression
Example Data
Tar
The Jar Utility
The Pax Utility
Compress and Uncompress
Summary
Chapter 17: Grep
Regular Expressions
Options
Extended Regular Expressions (Egrep)
Fgrep
Exit Status
Summary
Chapter 18: Sed
Forms of the Sed Command
Sed Options
Sed Commands
Examples
Sed Scripts
Summary
Chapter 19: Writing Programs for Qshell
Running Programs within Qshell
Writing RPG Programs for Qshell
Writing COBOL Programs for Qshell
Writing C and C++ Programs for Qshell
Writing Java Programs for Qshell
Option Parameters
Summary
Chapter 20: Accessing OS/400-Specific Objects
System
Liblist
Sysval
Datarea
Dataq
Db2
Sql Scripts
Db2 in Interactive Mode
Rfile
Summary
Chapter 21: Application Development Tools
The ISeries Tools for Developers
Qshell and ASCII Data
Graphical Utilities
The Ez Utility
Summary
Chapter 22: The Perl Utility
Running Perl
Perl Syntax
Perl Examples
Summary
Chapter 23: Java Development Tools
The Java Utility
The Javac Utility
The Javadoc Utility
The Jar Utility
Java Examples
Summary
Chapter 24: C and C++ Development Tools
Compiling C and C++
Examples
Summary
Appendix A: Summary of Changes by Release
V5R2
V5R1
V4R4
V4R3
Appendix B: Qshell Versus DOS
Case-Sensitivity
Options (Switches)
Separation of Tokens
Comparison of Commands
Appendix C: Qshell and CL Commands for the IFS
Qshell Commands for IFS Objects
CL Commands for the IFS
Index |
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