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Expect is quickly becoming a part of every UNIX user's toolbox. It allows you to automate Telnet, FTP, passwd, rlogin, and hundreds of other applications that normally require human interaction. Using Expect to automate these applications will allow you to speed up tasks and, in many cases, solve new problems that you never would have even considered before.For example, you can use Expect to test interactive programs with no changes to their interfaces. Or wrap interactive programs with Motif-like front-ends to control applications by buttons, scrollbars, and other graphic elements with no recompilation of the original programs. You don't even need the source code! Expect works with remote applications, too. Use it to tie together Internet applications including Telnet, Archie, FTP, Gopher, and Mosaic.Don Libes is the creator of Expect as well as the author of this book. In Exploring Expect, he provides a comprehensive tutorial on all of Expect's features, allowing you to put it immediately to work on your problems. In a down-to-earth and humorous style, he provides numerous examples of challenging real-world applications and how they can be automated using Expect to save you time and money.Expect is the first of a new breed of programs based on Tcl, the Tool Command Language that is rocking the computer science community. This book provides an introduction to Tcl and describes how Expect applies Tcl's power to the new field of interaction automation. Whether your interest is in Expect or interaction automation or you simply want to learn about Tcl and see how it has been used in real software, you will find Exploring Expect a treasure trove of easy-to-understand and valuable information.
- Sales Rank: #504568 in Books
- Brand: Brand: O'Reilly Media
- Published on: 1994-12-11
- Original language: English
- Number of items: 1
- Dimensions: 9.19" h x 1.30" w x 7.00" l, 2.10 pounds
- Binding: Paperback
- 606 pages
- Used Book in Good Condition
From the Publisher
Expect is quickly becoming a part of every UNIX user's toolbox. It allows you to automate Telnet, FTP, passwd, rlogin, and hundreds of other applications that normally require human interaction. Using Expect to automate these applications will allow you to speed up tasks and, in many cases, solve new problems that you never would have even considered before. For example, you can use Expect to test interactive programs with no changes to their interfaces. Or wrap interactive programs with Motif-like front-ends to control applications by buttons, scrollbars, and other graphic elements with no recompilation of the original programs. You don't even need the source code! Expect works with remote applications, too. Use it to tie together Internet applications including Telnet, Archie, FTP, Gopher, and Mosaic. Don Libes is the creator of Expect as well as the author of this book. In Exploring Expect, he provides a comprehensive tutorial on all of Expect's features, allowing you to put it immediately to work on your problems. In a down-to-earth and humorous style, he provides numerous examples of challenging real-world applications and how they can be automated using Expect to save you time and money. Expect is the first of a new breed of programs based on Tcl, the Tool Command Language that is rocking the computer science community. This book provides an introduction to Tcl and describes how Expect applies Tcl's power to the new field of interaction automation. Whether your interest is in Expect or interaction automation or you simply want to learn about Tcl and see how it has been used in real software, you will find Exploring Expect a treasure trove of easy-to-understand and valuable information.
About the Author
Don Libes is married to Susan Mulroney, a professor in the Department of Physiology and Biophysics at the Georgetown University School of Medicine. Sue performs research in the area of kidney growth and development. Their well-hydrated daughter, Kenna, has two lovely kidneys.
Most helpful customer reviews
1 of 1 people found the following review helpful.
VERY well written-- must have for your Unix toolbox.
By RM
I've been using this book for over 13 years, and it's still current, still very useful. My only issue is that the author needs to port it to more languages. I'd love to see a Don Libes version of Expect not only for TCL, but for Ruby, Python, and even the new Go (from google).
THe best thing about expect is that instead of just firing off commands via shell script, it can interact with those commands. For example if you write a script that uses SSH, SSH can give you multiple different responses asking for passphrase, password, accept public key from server. Expect can work like a switch statement to handle all of these:
expect {
-re "\[P|p]assword" {
send "$passwd\r"
exp_continue
}
"Are you sure you want to continue connecting" {
send "yes\r"
}
-re "\[P|p]assphrase" {
send "$passphrase\r"
exp_continue
-re $prompt
}
Very simple.
2 of 2 people found the following review helpful.
Powerful tool, painful book
By Michael Ernest
I picked up Exploring Expect: A Tcl-based Toolkit for Automating Interactive Programs (Nutshell Handbooks) to get started on a regression-testing framework for common Unix programs. I was also very curious to see how Tcl was used to make this tool.
To those ends, I wasn't disappointed. Expect makes it possible to automate tedious interactive work at the interface level. One can write concise, if not elegant, scripts. The cost of brevity, as if often the case with tools of this sort, is directly proportional to one's ignorance of expect's features and how they are implemented. And, if you'd like to approach Tcl by way of example, expect is as good a choice as I've come across.
This guide, on the other hand, is often a discouraging chore to read. It's as if a shoebox of index cards, each detailing one specific feature, was sorted through and applied to flesh out the book's outline. Taken individually, these elements do make sense, providing sometimes useful examples, sometimes curious tangents, sometimes tedious cautionary tales of edge cases. Taken as a whole, it's difficult to see the forest for the trees in this guide. One could say this book is good reference material; it is indexed well, and the outline is clear enough. If it had a reference style, I could see that point.
The book however has an expository form. It employs inline cross-references and footnotes where a sidebar or a simple table would have been a welcome relief from flipping back and forth. These research-style choices enforce the idea that the book was assembled from notes, and never quite realized as a whole guide. As a result, it's closer in feel to a set of anecdotes than a reference guide. It is a style that, as an instructor, I find often discourages users, primarily beginners or others who do not have a formal technical education.
Expect is of course a valuable tool. I'm grateful to the author for making it and sharing it. I'm also surprised, however, that in the last 15 years no one has thought they could do a better job in explaining, and therefore promoting, such a useful application.
1 of 1 people found the following review helpful.
If You're Using Expect, You Need This
By Brian R. Neradt
I've worked with Expect pretty extensively, writing much test code with it and creating several helper scripts to make things easier. I assume here that you know what Expect is and have decided to use it, thus I'm reviewing the book and not the language.
Here's the short: In my experience if you'll be working with Expect, you pretty much need this book. Googling on the word Expect is useless (putting 'Gnu' in front of 'Expect' helps). Further, the two big keywords Expect adds are 'send' and 'expect'. That makes searching for help online tricky. Even with that aside, I simply find that there just isn't terribly much online to help you.
So you need this book. Others here point out that organizationally the book leaves some to be desired. I've felt that in the past as well. There have been many times where I knew I read something but haven't been able to figure out what section it would be in when I go back to find it. For this I dock a star for the book.
Still, I'm fairly happy with it as it has gotten me going many times.
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