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Shell Programming and Scripting
Quick perl question
Post 43962 by jason_v on Tuesday 25th of November 2003 11:12:22 PM
11-26-2003
Hey guys,
Thanks for the replies, I was able to get it work with that, I appreciate it. It's not a homework assignment for me. I think it may have been for a friend of mine, it's from a book called "A Little Book on Perl".
My friend took a UNIX class and he got that book with it. I got the book from him, and I'm going through the excercises right now just for fun. I don't have any of the O'Reilly books on Perl, but perhaps I should pick one of those up since they seem to be recommended quite a bit.
I have another quick question here... Another pretty stupid one that seems like it should be pretty obvious, but for some reason when I try it, it doesn't work.
Let's say I have the user enter a four-digit number on the keyboard. Then I want to output the two middle numbers. How would I do something simple like this? If someone could give me a few ideas, that'd be sweet... Thanks
-Jason
Thanks for the replies, I was able to get it work with that, I appreciate it. It's not a homework assignment for me. I think it may have been for a friend of mine, it's from a book called "A Little Book on Perl".
My friend took a UNIX class and he got that book with it. I got the book from him, and I'm going through the excercises right now just for fun. I don't have any of the O'Reilly books on Perl, but perhaps I should pick one of those up since they seem to be recommended quite a bit.
I have another quick question here... Another pretty stupid one that seems like it should be pretty obvious, but for some reason when I try it, it doesn't work.
Let's say I have the user enter a four-digit number on the keyboard. Then I want to output the two middle numbers. How would I do something simple like this? If someone could give me a few ideas, that'd be sweet... Thanks
-Jason
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LEARN ABOUT CENTOS
perlbook
PERLBOOK(1) Perl Programmers Reference Guide PERLBOOK(1) NAME
perlbook - Books about and related to Perl DESCRIPTION
There are many books on Perl and Perl-related. A few of these are good, some are OK, but many aren't worth your money. There is a list of these books, some with extensive reviews, at http://books.perl.org/ . We list some of the books here, and while listing a book implies our endorsement, don't think that not including a book means anything. Most of these books are available online through Safari Books Online ( http://safaribooksonline.com/ ). The most popular books The major reference book on Perl, written by the creator of Perl, is Programming Perl: Programming Perl (the "Camel Book"): by Larry Wall, Tom Christiansen, and Jon Orwant ISBN 978-0-596-00027-1 [3rd edition July 2000] http://oreilly.com/catalog/9780596000271/ The Ram is a cookbook with hundreds of examples of using Perl to accomplish specific tasks: The Perl Cookbook (the "Ram Book"): by Tom Christiansen and Nathan Torkington, with Foreword by Larry Wall ISBN 978-0-596-00313-5 [2nd Edition August 2003] http://oreilly.com/catalog/9780596003135/ If you want to learn the basics of Perl, you might start with the Llama book, which assumes that you already know a little about programming: Learning Perl (the "Llama Book") by Randal L. Schwartz, Tom Phoenix, and brian d foy ISBN 978-0-596-52011-3 [5th edition June 2008] http://oreilly.com/catalog/9780596520113 The tutorial started in the Llama continues in the Alpaca, which introduces the intermediate features of references, data structures, object-oriented programming, and modules: Intermediate Perl (the "Alpaca Book") by Randal L. Schwartz and brian d foy, with Tom Phoenix foreword by Damian Conway ISBN 978-0-596-00478-1 [1st edition March 2006] http://oreilly.com/catalog/9780596004781/ References You might want to keep these desktop references close by your keyboard: Perl 5 Pocket Reference by Johan Vromans ISBN 978-0-596-00374-6 [4th edition July 2002] http://oreilly.com/catalog/9780596003746/ Perl Debugger Pocket Reference by Richard Foley ISBN 978-0-596-00503-0 [1st edition January 2004] http://oreilly.com/catalog/9780596005030/ Regular Expression Pocket Reference by Tony Stubblebine ISBN 978-0-596-51427-3 [July 2007] http://oreilly.com/catalog/9780596514273/ Tutorials Beginning Perl by James Lee ISBN 1-59059-391-X [3rd edition April 2010] http://www.apress.com/9781430227939 Learning Perl by Randal L. Schwartz, Tom Phoenix, and brian d foy ISBN 978-0-596-52010-6 [5th edition June 2008] http://oreilly.com/catalog/9780596520106 Intermediate Perl (the "Alpaca Book") by Randal L. Schwartz and brian d foy, with Tom Phoenix foreword by Damian Conway ISBN 0-596-10206-2 [1st edition March 2006] http://oreilly.com/catalog/9780596102067 Mastering Perl by brian d foy ISBN 978-0-596-10206-7 [1st edition July 2007] http://www.oreilly.com/catalog/9780596527242 Effective Perl Programming by Joseph N. Hall, Joshua A. McAdams, brian d foy ISBN 0-321-49694-9 [2nd edition 2010] http://www.effectiveperlprogramming.com/ Task-Oriented Writing Perl Modules for CPAN by Sam Tregar ISBN 1-59059-018-X [1st edition August 2002] http://www.apress.com/9781590590188 The Perl Cookbook by Tom Christiansen and Nathan Torkington with foreword by Larry Wall ISBN 1-56592-243-3 [2nd edition August 2003] http://oreilly.com/catalog/9780596003135 Automating System Administration with Perl by David N. Blank-Edelman ISBN 978-0-596-00639-6 [2nd edition May 2009] http://oreilly.com/catalog/9780596006396 Real World SQL Server Administration with Perl by Linchi Shea ISBN 1-59059-097-X [1st edition July 2003] http://www.apress.com/9781590590973 Special Topics Regular Expressions Cookbook by Jan Goyvaerts and Steven Levithan ISBN 978-0-596-52069-4 [May 2009] http://oreilly.com/catalog/9780596520694 Programming the Perl DBI by Tim Bunce and Alligator Descartes ISBN 978-1-56592-699-8 [February 2000] http://oreilly.com/catalog/9781565926998 Perl Best Practices by Damian Conway ISBN: 978-0-596-00173-5 [1st edition July 2005] http://oreilly.com/catalog/9780596001735 Higher-Order Perl by Mark-Jason Dominus ISBN: 1-55860-701-3 [1st edition March 2005] http://hop.perl.plover.com/ Mastering Regular Expressions by Jeffrey E. F. Friedl ISBN 978-0-596-52812-6 [3rd edition August 2006] http://oreilly.com/catalog/9780596528126 Network Programming with Perl by Lincoln Stein ISBN 0-201-61571-1 [1st edition 2001] http://www.pearsonhighered.com/educator/product/Network-Programming-with-Perl/9780201615715.page Perl Template Toolkit by Darren Chamberlain, Dave Cross, and Andy Wardley ISBN 978-0-596-00476-7 [December 2003] http://oreilly.com/catalog/9780596004767 Object Oriented Perl by Damian Conway with foreword by Randal L. Schwartz ISBN 1-884777-79-1 [1st edition August 1999] http://www.manning.com/conway/ Data Munging with Perl by Dave Cross ISBN 1-930110-00-6 [1st edition 2001] http://www.manning.com/cross Mastering Perl/Tk by Steve Lidie and Nancy Walsh ISBN 978-1-56592-716-2 [1st edition January 2002] http://oreilly.com/catalog/9781565927162 Extending and Embedding Perl by Tim Jenness and Simon Cozens ISBN 1-930110-82-0 [1st edition August 2002] http://www.manning.com/jenness Pro Perl Debugging by Richard Foley with Andy Lester ISBN 1-59059-454-1 [1st edition July 2005] http://www.apress.com/9781590594544 Free (as in beer) books Some of these books are available as free downloads. Higher-Order Perl: http://hop.perl.plover.com/ Other interesting, non-Perl books You might notice several familiar Perl concepts in this collection of ACM columns from Jon Bentley. The similarity to the title of the major Perl book (which came later) is not completely accidental: Programming Pearls by Jon Bentley ISBN 978-0-201-65788-3 [2 edition, October 1999] More Programming Pearls by Jon Bentley ISBN 0-201-11889-0 [January 1988] A note on freshness Each version of Perl comes with the documentation that was current at the time of release. This poses a problem for content such as book lists. There are probably very nice books published after this list was included in your Perl release, and you can check the latest released version at http://perldoc.perl.org/perlbook.html . Some of the books we've listed appear almost ancient in internet scale, but we've included those books because they still describe the current way of doing things. Not everything in Perl changes every day. Many of the beginner-level books, too, go over basic features and techniques that are still valid today. In general though, we try to limit this list to books published in the past five years. Get your book listed If your Perl book isn't listed and you think it should be, let us know. perl v5.16.3 2013-03-04 PERLBOOK(1)