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While the GNU project includes Perl in its distributions, there is no such thing as GNU Perl Perl is not produced or maintained by GNU and the Free Software Foundation Perl is also made available on a much more open license than the GNU Public License GNU stands for the recursive GNU s Not Unix, and is part of the Free Software Foundation, an organization devoted to providing a suite of useful user software for free
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Because Perl is similar to a number of different languages, it is not only easy to learn but also easy to continue learning Its structure and format is very similar to C, awk, shell script, and, to a greater or lesser extent, even BASIC If you have ever done any form of programming, you re half way toward learning programming in Perl In many cases, you will only use a very small subset of Perl to complete most tasks The guiding motto for Perl development is there s more than one way to do it This makes Perl s learning curve very shallow and very long Perl is a large language with a great many features, and there is a lot you can learn if you want to
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Perl has been used by thousands of different corporations to tackle and solve different problems For most people, it has reduced the development time for their desired application by days, weeks, or even months Below is a sample of the bigger companies that have used Perl I ve tried to include testimonials and deeper examples of how Perl was the better solution, where the information has been available I Amazoncom, one of the Internet s best known and most successful e-commerce sites, used Perl to develop an entire editorial production and control system This integrates the authoring, maintenance (including version control and searching), and output of the editorial content of the entire Amazoncom website I Netscape engineers wrote a content management and delivery system, with logging, analysis, and feedback on use, in three months using Perl I In order to get around many cross-platform development problems, SPEC (the Standard Performance Evaluation Corporation) used Perl as a wrapper around the C code that is used to test performance With Perl s ability to import and dynamically use external C code in combination with its object-oriented abilities, SPEC generated a test system that was easily portable from Unix to the Windows NT platform
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I Using an old 60MHz Pentium and Perl, a New England hospital implemented a distributed printing system that connected 20,000 PC workstations to 3,000 printers spread over an entire city On a personal level, I have Perl scripts that create users, add new virtual WWW servers to Apache, monitor all the machines and storage on my network, keep track of all my archives and e-mail, and even scripts that download weather information from my weather center and get the TV listings every day!
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2
Perl Overview
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Perl: The Complete Reference
erl is a relatively unstructured language Although it does, of course, have rules, most of the restrictions and rules that you may be used to in other languages are not so heavily enforced For example, you don t need to worry too much about telling Perl what you are expecting to do with your program (or script or application), or what variable s subroutines or other elements you are either going to use or introduce This approach leads to what is called There Is More Than One Way to Do It (TIMTOWTDI, or tim toady for short) syndrome which refers to the fact that there are different ways of achieving the same result, all of which are legally valid In fact, a Perl program is as easy as
print "Hello World\n";
Note that there s nothing before that statement to tell Perl what it needs in order to print out that message Compare it to a similar C program:
#include <stdioh> int main() { printf("Hello World\n"); }
In Perl there is no main (well, not in the same sense as there is in C) execution of a Perl script starts with the first statement in the list and continues until the end of the file We don t need to tell Perl to explicitly exit the program, or give a return value to the caller; Perl will handle all of that for us The rest of this chapter is given over to describing how to create Perl scripts and use Perl to execute scripts, and to describing the basic components that make up a Perl program The rest of this section of the book is devoted to giving more detail on each of these elements (and more) so that you will have a complete understanding of how to write basic Perl programs The rest of the book looks at more advanced topics, such as object orientation, networking, and interface and web development
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