By Tom Christiansen, Nathan Torkington
Discover a Perl programmer, and you'll discover a reproduction of Perl Cookbook within sight. Perl Cookbook is a complete choice of difficulties, strategies, and sensible examples for a person programming in Perl. The e-book comprises hundreds of thousands of carefully reviewed Perl "recipes" and hundreds of thousands of examples starting from short one-liners to accomplish applications.
The moment version of Perl Cookbook has been totally up-to-date for Perl 5.8, with broad adjustments for Unicode aid, I/O layers, mod_perl, and new applied sciences that experience emerged because the past version of the booklet. Recipes were up to date to incorporate the most recent modules. New recipes were additional to each bankruptcy of the booklet, and a few chapters have virtually doubled in size.
Covered subject components include:
Manipulating strings, numbers, dates, arrays, and hashes
Pattern matching and textual content substitutions
References, facts constructions, items, and classes
Signals and exceptions
Screen addressing, menus, and graphical applications
Managing different processes
Writing safe scripts
Internet functions programming with mail, information, ftp, and telnet
CGI and mod_perl programming
Since its first liberate in 1998, Perl Cookbook has earned its position within the libraries of significant Perl clients of all degrees of craftsmanship by way of offering functional solutions, code examples, and mini-tutorials addressing the demanding situations that programmers face. Now the second one version of this bestselling ebook is able to earn its position one of the ranks of favourite Perl books as well.
Whether you're a beginner or veteran Perl programmer, you'll locate Perl Cookbook , 2d version to be essentially the most worthy books on Perl on hand. Its cozy dialogue type and exact awareness to aspect disguise on the subject of any subject you'd need to know approximately. you will get via with no need this publication on your library, yet as soon as you've attempted some of the recipes, you won't are looking to.
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Additional info for Perl Cookbook (2nd Edition)
The environment variables PERLIO, PERL_ENCODING, and PERL_UNICODE all give Perl various sorts of hints related to these matters. 1 Accessing Substrings Problem You want to access or modify just a portion of a string, not the whole thing. For instance, you’ve read a fixed-width record and want to extract individual fields. Solution The substr function lets you read from and write to specific portions of the string. $value = substr($string, $offset, $count); $value = substr($string, $offset); substr($string, $offset, $count) = $newstring; substr($string, $offset, $count, $newstring); # same as previous substr($string, $offset) = $newtail; The unpack function gives only read access, but is faster when you have many substrings to extract.
So ||= is used to set a variable when that variable is itself still false. Since the || check is a simple Boolean one—testing for truth—it doesn’t care about undefined values, even when warnings are enabled. Establishing a Default Value This is the Title of the Book, eMatter Edition Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved. | 11 Here’s an example of ||= that sets $starting_point to "Greenwich" unless it is already set. Again, we assume $starting_point won’t have the value 0 or "0", or that if it does, it’s okay to change it.
Thank you all. xxxiv | Preface This is the Title of the Book, eMatter Edition Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved. Chapter 1 CHAPTER 1 Strings He multiplieth words without knowledge. 0 Introduction Many programming languages force you to work at an uncomfortably low level. You think in lines, but your language wants you to deal with pointers. You think in strings, but it wants you to deal with bytes. Such a language can drive you to distraction. Don’t despair; Perl isn’t a low-level language, so lines and strings are easy to handle.
Perl Cookbook (2nd Edition) by Tom Christiansen, Nathan Torkington