Free Ebook KornShell Programming Tutorial
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KornShell Programming Tutorial
Free Ebook KornShell Programming Tutorial
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From the Inside Flap
Research indicates that virtually no one actually reads prefaces in computer books. In fact, this preface could be about the Loch Ness Monster for all most readers care.But why don't people read prefaces? Is it because prefaces sometimes get too personal? ("..and I want to thank Sal, who made this book possible.") Is it because the sentiments of nerdy authors can be a bit repulsive? ("..Sal, my MicroVAX, was always there when I needed her.") Is it because they are predictably self-deprecatory in an ironic way? ("..and I want to thank: list of 250 noted experts goes here for reviewing drafts of this manual. Naturally all mistakes are my own.") No, when it comes right down to it, people avoid prefaces because they're boring. It is also de rigueur for the nerdish author to explain, folksinger style, why he or she decided to write this piece. I guess this book sort of came to me while I was camping out in the glorious Rocky Mountains. I was gazing at pristine waterfalls and awe-inspiring sunsets when I said to myself, "This land must be preserved. I shall write a KornShell book." Possessed by a demonic ecological fervor, I roared down that mountain in a snowmobile, fired up a 1200 watt workstation, and wrote it all down for you. I only ask that you use the power of the KornShell for good, rather than evil. Actually, I've been writing programming manuals for many years under the pen name "Apollo Computer Inc." Recently, my agent insisted that I change it to "Hewlett-Packard Company," presumably because it sounded less ethnic. Through the years, I've been lucky enough to get lots of feedback from my readers. What do you think they ask for? More text? No. More syntax? Definitely not. When it comes right down to it, readers consistently ask for only one thing: more examples. So, I listened to them and based this tutorial entirely on examples. I feel that short, focused examples are more valuable than long, detailed examples, and I've written the book accordingly. The purpose of the book is not to make me look clever; it is to make you look clever. Nevertheless, I've sprinkled a few lengthy examples into the mix for those of you who enjoy that sort of thing. When I was a mere lad my family doctor pointed to a massive encyclopedia of pharmaceuticals and told me that he could treat 90% of all patients with only six different medicines. Similarly, although the KornShell is a very rich language, my goal is to focus on the common script ailments and to leave the beriberi treatment to specialists. Beginners may be wondering, " Is this book too hard for me?" No, probably not. Programmers experienced in various languages, though not in the KornShell, are probably wondering, "Is this book too wimpy for me?" No, probably not. To help guide both kinds of readers through the book, I've marked certain sections as being more appropriate for one group or the other. Beginners don't need an explanation of traps and experienced programmers already know what loops are. Here's how I've organized the book: Chapter 1 introduces the KornShell and its features.Chapter 2 contains some simple KornShell scripts to get you started.Chapter 3 discusses data types.Chapter 4 shows you how to do simple math.Chapter 5 illustrates pattern matching.Chapter 6 explains how to evaluate conditions.Chapter 7 shows you how to set up loops.Chapter 8 describes how to create simple menus.Chapter 9 explains how to evaluate command line arguments.Chapter 10 illustrates functions.Chapter 11 has a lot of conceptual stuff in it about environments and inheritance. It also contains some sample start-up scripts.Chapter 12 examines input and output.Chapter 13 focuses on string manipulation.Chapter 14 describes the many variables that are part of the KornShell.Chapter 15 describes various advanced features of the KornShell. (This chapter is aimed at the sophisticated programmer.)Chapter 16 contains a half-dozen lengthy KornShell examples.Chapter 17 explains command line editing and the history file. Appendix contains a syntactic quick reference. This appendix will become more valuable to you as your KornShell experience increase. Since the KornShell runs on all sorts of operating systems, I've tried to keep operating system dependencies to a bare minimum. Nevertheless, my sense is that the majority of KornShell users are either working under the UNIX operating system or are at least marginally familiar with it. Therefore, in the examples that do contain commands, I've picked UNIX commands. It is now time for the obligatory not to the tools that made this book possible. I used the \fBtroff\fR.mm macro package to format drafts of this book (an experience akin to running blindfold through nettles) and then came to my senses and converted the whole thing to Interleaf TPS. //cascade, my trusty Apollo DN4000 workstation, was always there when I needed her. It practically goes without saying that I created camera-ready copy for the book on a Hewlett-Packard laser printer. My three primary reviewers were KornShell gurus David Korn, Steve Sommars, and Glenn Fowler, all of whom gave fantastic and diplomatic criticism. I also received important criticism and help from Tom Barstow, Dave Beckedorf, Bart Hanlon, Warren Johnson, Ed Johnston, Mark Keil, Mike Kong, Alice Lynch, Dave Penfield, Will Roaf, Frank Rubinsky, John Weiss, Daryl Winters, Teri Witham, and other people whose names I have no doubt forgotten to list. Eric Eldred and Quentin Sullivan found so many bugs in early drafts that, and I mean this as a compliment, they should have a brand of insecticide named after them. Judy Tarutz is my long-suffering editor. In person, Judy is a kind, gentle soul with an outrageous sense of humor. Give her a red pen though, and she turns into Conan the Barbarian. Her savage red pen cut a bloody swath through early drafts of this book. If we should chance to meet up one day, dear reader, I'll tell you all the "weak" jokes she made me take out. I'd also like to thank the members of the Academy. A consortium of great minds-those minds owned and operated by Ted Ricks, John Wait, Jack Danahy, and Steve Spicer-led me to the KornShell and helped me define the material for this book. Finally, I'd like to thank the person who really made this book possible: my wife and best friend, Marilyn. Whoops, almost forgot. Naturally, all mistakes are my own. 020156324XP04062001
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From the Back Cover
"This book is full of useful examples which will benefit anyone interested in programming in KornShell, especially novices."-David Korn, AT&T Bell Labs, Creator of KornShell The KornShell is the most important shell or interface, for the 1990's. It runs on the UNIX, OSF-1, MS-DOS, OS/2, and VMS operating systems. It supports every feature of the Bourne shell, and incorporates many of the good C shell features. If you program, you need the KornShell. If you want to learn the KornShell, you need this book.Barry Rosenberg makes learning and using the KornShell easy by writing in a light, humorous style. The book is packed with short non-trivial examples of shell scripts. Common programming pitfalls and their solutions are boldly highlighted in BEWARE sections throughout. Many chapters begin with sections of helpful hints for new programmers and for experienced programmers.Among its key features, the book: illustrates pattern matchingfocuses on string manipulationdetails inheritanceincludes a quick reference of KornShell statements 020156324XB04062001
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Product details
Paperback: 352 pages
Publisher: Addison-Wesley Professional; 1 edition (July 11, 1991)
Language: English
ISBN-10: 020156324X
ISBN-13: 978-0201563245
Product Dimensions:
7.2 x 0.8 x 9 inches
Shipping Weight: 1.3 pounds (View shipping rates and policies)
Average Customer Review:
4.7 out of 5 stars
34 customer reviews
Amazon Best Sellers Rank:
#1,360,858 in Books (See Top 100 in Books)
This book is *the* way to begin working with the Korn shell. I needed to get up to speed with a shell scripting language in order to do Oracle DBA tasks. I bought this based on the strength of it's Amazon ratings and was completely delighted.The author has a great style, easy to understand and very clear. I found the procession of topics to be very logical; a nice gradual build up from the simple to the more complex. There is plenty of 'depth' in each chapter and good highlighting of potential problem areas and difficult concepts. These have additional coverage to help steer clear of the hassles and come to a clear understanding of the more challenging ideas.The examples are well thought out, they present each topic of interest clearly and in a meaningful way, without clutter. I have coded almost every single one and found only a few errors. Within a chapter the examples are presented with increasing complexity, but are never the page after page monsters that leave you lost. It is amazing how well the author illustrates the content with short (20 - 30 line) samples.When I was puzzled with something I had read here, I turned to two of my friends who 'live' in shell scripting up to their necks. Both have learned useful techniques from this book through my questions.My copy is literally starting to come apart from constant use for reference. It is that good.
Excellent "tutorial" with basic, simple, yet concise examples. I have the O'Reilly book "Korn Shell" but this one really gave clear examples and practice results. Even got into some more advanced features but in confirmed what I learned from the O'Reilly book. I definitely recommend this book to brush up or strengthen any beginner's level knowledge on shell programming/scripting in general but definitely on the most popular and powerful shell....Korn. I feel more confident in programming at the Shell level than I ever had before.
This is an awesome book! For people who think they need to either learn,brush up their shell scripting skills,look no further! THIS IS THE BOOK you NEED!! I have some experience writing small bash scripts,but not exactly good at it. Trying to be good at scripting though and my search for a book which can teach you the tricks of the trade in the simplest way possible,led me to this book. And I feel vindicated with my choice. Barry is an excellent writer + teacher. He knows how to make it interesting. I am enjoying this book and looking forward to writing some powerful scripts which get the job done!
I purchased this book in 2009. I use IBM's AIX, which still uses this version of ksh as the default shell. This book does a great job of presenting the information from the ground up. It appeals both to the novice and the experienced programmer. With the knowledge obtained from this book, I have put together a 6000 line ksh script that is used both as a personal productivity tool as well as an automated code compilation tool in a nightly cron job. Before this book I had minimal ksh programming skills (but extensive C programming skills). This is money well spent. Read it through a couple of times while working on the tool. I keep it with me as a reference. Highly recommend it and it is still relevant after all of these years.
This book was published 17 years ago (from the time of writing this comment).At the beginning I was a bit reluctant about buying this book and I was thinking maybe the book is a bit old and does not fully cover the subject.However, after reading all the 5 stars comments written by amazoncustomers and more surprisingly after seeing that everybody (without exception !!) had given 5 stars to the book, I said to myself "hey man, let's try this book". This is the first book that I used to learn Korn Shell (In fact I had found the job of my dreams which needed me to learn very fast the KornShell language, that I didn't know at all).I'm really happy about my decision. The book is really well written, witha very clear and simple language and contains loads of pertinentexamples. I highly recommend it particularly for those who are going tolearn the KornShell for the first time.It took me only one week (roughly 4 hours per day) to read and finishthis book.Try it! you won't regret it, trust me!!
No theory, no stories, the author lets you work hands on in Korn shell. The book is organized in a way that you do NOT have to read the whole book to use Korn Shell. There are practical examples that explain every little thing you might want to do with the Korn shell. This was extremely useful for me since I am a developer who has to write programs on demand and I do not have the time to read theories or stories. This book is very highly recommended!
This is absolutely the best book on Korn Shell scripting!! It has good examples along with a great index for finding solutions as you write scripts. I have 2-3 copies of this book and used to keep it with me all the time when doing work on UNIX systems for clients. Terse and direct.
This is a great KSH reference. I'd previously purchased the book new and loved the examples. I would recommend this title for anyone new to shell scripting or anyone looking for solid KSH examples.
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