Ebook Free UNIX Shell Programming, Revised Edition
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UNIX Shell Programming, Revised Edition
Ebook Free UNIX Shell Programming, Revised Edition
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Product details
Series: Hayden Books UNIX System Library
Paperback: 512 pages
Publisher: Sams; 1st edition (December 1, 1989)
Language: English
ISBN-10: 067248448X
ISBN-13: 978-0672484483
Product Dimensions:
9.1 x 7.4 x 0.8 inches
Shipping Weight: 1.9 pounds
Average Customer Review:
3.8 out of 5 stars
23 customer reviews
Amazon Best Sellers Rank:
#1,455,708 in Books (See Top 100 in Books)
I am a perl and C programmer, and I am very familiar with the shells outlined in this book. So the material was not particularly "new" for me. I can see how it would be difficult to understand for a user who was new to shell programming.If the intended audience is the intermediate unix user who knows something of programming, this book gets a full 5 star, my seal-of-approval rating. Terrific.One thing it is lacking is a brief mention of perl or of awk. In many cases, it is simpler to write:date | awk '{ print $2 }'instead of:date | cut -d' ' -f2or, at least from the standpoint of understandability and readability. but the book doesnt claim to be a manual for awk, and oreilly has an excellent book on the subject.I continually recommend this book to people, and where ever I go, I find this book on the bookshelves of successful people.
About 10 years ago, I bought a copy of this book, because it was the required textbook for a course entitled "Introduction to Unix Shell Script Programming". In the intervening years, I lost my original copy (actually think it was swiped by a co-worker).Occasionally, I've missed not having my copy of the "Kochan & Wood" book at hand, especialy when I needed a reminder of how do some little thing in Shell quickly. (I find O'Reilly's "llama" Perl book of similar value as a Perl quick reference.) Anyway, I am glad I finally took the time to shop around and find a mint condition replacement!A quick review of my new copy tells me why I always missed it. It's a well-written, down to earth, and comprehensive overview of Shell....and is especially valuable for those who are new to Unix/Linux/BSD/OSX etc. For the "old timers", it's a nice, nostalgic, but still relevant, memory-jogger.
Good book.
This book is good if you are a casual user of a UNIX system, it will help you write scripts to automate your routine tasks. The book does not cover every option of every command in every shell, which can be frustrating at times - especially if you are trying to figure out someone else's script. If you need to do hardcore shell programming then this is not the book for you, but if you find yourself typing the same commands over and over, then this book will definitely help.
This and the Bruce Blinn book are the best books available on shell programming. Very thorough, well written, and well indexed. There are many usefull examples and no stupid fluff that is so pervasive in recent technical books.
I found this book to be quite good, but there is a very harsh introduction to regular expressions with ed, sed etc..I have referred to this book many times as a reference guide.
Although published in 1990, this book could still function well as an introduction to UNIX and (Bourne) shell programming, provided one is aware of some changes to the shell in most implementations of UNIX since that date. Also, the Perl language has come on strong in recent years, and depending on your tastes (and time), that language can be used with great efficiency to do the tasks that are traditionally done in the shell. After a quick review of the basics of UNIX, the authors give a purely descriptive explanation of the UNIX shell in chapter 3. Emphasizing that it is an interpretive language, the most commonly used shell commands are discussed in chapter 4, starting with a discussion of regular expressions. The cut, paste, sed, tr, grep, uniq, and sort commands are treated in detail. In chapter 5, one begins the actual task of creating shell programs using shell variables. There is no data typing in the shell, so values can be assigned to variables without noting their type as integer, float, etc. The authors only briefly discuss the mechanism in shell programming. The method by which the shell interprets quotation characters is covered in the next chapter. The single, double, backslash, and back quote characters are discussed in detail. Noting that arithmetic operations are done on values stored in variables in the shell, the authors show to proceed with these operations using the expr program. The mechanisms for passing arguments to shell programs is treated in chapter 7, the authors showing how to write shell programs that take arguments typed on the command line. The role of positional variables for delaying assignment after normal command line processing is discussed. The $#, and $* variables are discussed briefly, with $# getting set to the number of arguments typed on the command line and $* used for programs taking a variable number of arguments. The shift command is explained well as a method to allow one to use more than nine arguments to a program. The ability of shell programs to execute decision blocks is treated in chapter 8, via the if statement. The role of the test and exit commands are in if blocks are discussed in good detail. In addition, the case command, familiar to C programmers is introduced as a technique to allow a single value to be compared against other values. The && and || constructs are used to show the reader how to execute commands that are contingent on the success or failure of the preceding command. Program loops, via the for, while, and until commands are discussed in chapter 9, followed in the next chapter by a discussion of how to read data from the terminal or from a file using the read command. The ability to perform I/O redirection is discussed also. Local and export variables are discussed in the next chapter on the user environment, and the authors give a good summary of how these work in shell programming. More discussion on parameter passing is done in chapter 12, with the different methods of parameter substitution given detailed treatment. The authors show how to use the $0 variable to check whether two or more programs have been executed, and how to use the set command to set shell options and to reassign positional parameters. This is followed in the next chapter by a discussion of the eval command, which makes the shell scan the command line twice before executing it, and the wait command, which will allow serialization in program execution. The trap and type commands are discussed also. The Korn shell is discussed in chapter 15, with emphasis on the features added to Korn shell that cannot be found in the Bourne shell. The vi and emacs capability of this shell is briefly discussed in this chapter. The differences between Korn shell functions and Bourne shell functions are discussed in detail by the authors. Most importantly, the ability of the Korn shell to do integer arithmetic without using the expr command is discussed via the let command, which is built-in to the Korn shell. Also, the capability of the Korn shell to support data typing is discussed, along with its pattern matching capabilities. Pattern matching is done most efficiently now using Perl however.
I have owned this book now for at least 10 years. This is the book that taught me Shell programming in the first place. And it is as useful as ever.It reviews the basics, covers the Bourne shell and the Korn shell in simple step-by-step tutorials, and will help you through the minefield of syntax. And when you're finished with it, you'll always keep it on your shelf as a reference.Though I don't get my hands dirty nearly as often as what I used to, I always keep "Unix shell programming" handy, just in case.
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