Post on 24-Dec-2015
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
IntermediatePerl Programming
Class One
Instructor: Byrne Reese
X401
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
About the Instructor
• Byrne Reese– Product Manager, Six Apart– Lead Developer, SOAP::Lite– Perl Hacker and Open Source Junkie
• Contact Info:– byrne@majordojo.com– AIM: byrnereese– http://www.majordojo.com/
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
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.
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
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
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
“Required” Reading
• Perl CookbookSecond Editionby Tom Christiansen, Nathan Torkington
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
Recommended Reading
• The O’Reilly Perl Series is always a good reference!
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
Recommended Reading
• But O’Reilly is not the only publisher of Perl books!
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
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.
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
Homework and Grades
• Primary goal of this class:– To learn
• Your key to success: Engage– Class participation– Homework
• How your final grade is determined
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
Getting Started
A Perl Primer
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
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
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
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…
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
Hello World
#!/usr/bin/perlprint “Hello World”;
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
Hello World
#!/usr/bin/perlmy $say_hello_to = $ARGV[0];$say_hello_to ||= “World”;print “Hello $say_hello_to\n”;
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
Hello World
#!/usr/bin/perluse Getopt::Long;my $say_hello_to = “World”;GetOptions(“to=s"=>\$say_hello_to);print “Hello $say_hello_to\n”;
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
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”;
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
Hello World on the Web
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
A Few Basics First
• Setting up your Web server• Content Headers• File Permissions
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
helloworld.cgi
#!/usr/bin/perlprint “Content-type: text/plain\n\n”;print “Hello World”;
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
Perl and the Web
• Creating a web form – an HTML primer
• How Perl handles web requests • Parsing web form input
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
CGI.pm
Don’t re-invent the wheel: use a Perl module!
• Using CGI.pm• print header;• param(‘say_hello_to’)
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
Homework
Copyright 2007 Byrne Reese. Distributed under Creative Commons, share and share alike with attribution.
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!