Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with...

Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.

IntermediatePerl Programming

Class One

Instructor: Byrne Reese

X401


About the Instructor

• Byrne Reese– Product Manager, Six Apart– Lead Developer, SOAP::Lite– Perl Hacker and Open Source Junkie

• Contact Info:– [email protected]– AIM: byrnereese– http://www.majordojo.com/


Intended Audience

• Anyone interested in taking their basic Perl knowledge to the next step for:– professional use– personal use

• Someone with a strong grasp of the Perl fundamentals: scalars, lists, arrays, subroutines, etc.


Objectives• Deepen your knowledge and fluency in Perl• Learn practical Perl skills• Master CPAN and frequently used modules• Improve your programming and problem

solving skills• Learn how to help yourself• Learn by doing:

– Build and publish web pages– Execute queries against a database– Extract and mine the web for data– Parse XML– Create your own Perl modules


“Required” Reading

• Perl CookbookSecond Editionby Tom Christiansen, Nathan Torkington


Recommended Reading

• The O’Reilly Perl Series is always a good reference!


Recommended Reading

• But O’Reilly is not the only publisher of Perl books!


Setting Expectations

• This is an incredibly challenging class– Intensive– Technical

• This can be a very frustrating class– “Some” system administration required

• Bottom line:– It takes more than the knowledge of a

programming language to make a software engineer.


Homework and Grades

• Primary goal of this class:– To learn

• Your key to success: Engage– Class participation– Homework

• How your final grade is determined


Getting Started

A Perl Primer


Your First Program

1. Write the ubiquitous Hello World script

2. Customize it to take a parameterized name to say “hello” to

3. If input is not provided, prompt the user for a name


Remember…

• Don’t get overwhelmed by the problem:

– Solve the problem in pieces.

• Don’t be afraid to look online for help!

• Ask each other questions!

• Code along with me…


Hello World

#!/usr/bin/perlprint “Hello World”;


Hello World

#!/usr/bin/perlmy $say_hello_to = $ARGV[0];$say_hello_to ||= “World”;print “Hello $say_hello_to\n”;


Hello World

#!/usr/bin/perluse Getopt::Long;my $say_hello_to = “World”;GetOptions(“to=s"=>\$say_hello_to);print “Hello $say_hello_to\n”;


Hello World

#!/usr/bin/perluse Getopt::Long;my $say_hello_to = undef;GetOptions(“to=s"=>\$say_hello_to);if (!defined($say_hello_to)) {

print “Please enter a name: ”;$say_hello_to = <STDIN>;chomp $say_hello_to;

}print “Hello $say_hello_to\n”;


Hello World on the Web


A Few Basics First

• Setting up your Web server• Content Headers• File Permissions


helloworld.cgi

#!/usr/bin/perlprint “Content-type: text/plain\n\n”;print “Hello World”;


Perl and the Web

• Creating a web form – an HTML primer

• How Perl handles web requests • Parsing web form input


CGI.pm

Don’t re-invent the wheel: use a Perl module!

• Using CGI.pm• print header;• param(‘say_hello_to’)


Homework


Your First Assignment

This sounds simple, but…

• Setup a web server at home, or access Berkeley’s network.

• Deploy the helloworld.cgi to that web server

• Make sure it works!

Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with...

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