(the language for getting your job done) Internet Programming Diana Hingst

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13 Δεκ 2013 (πριν από 3 χρόνια και 8 μήνες)

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(the language for getting your job done)


Internet Programming

Diana Hingst



Dynamic programming language


Intended to be practical (easy to use &
efficient)


Widely adopted for its text processing


One of “The Three P’s” (Perl, PHP, Python)
for writing web applications


File system manipulation


Database administration


Client
-
server programming


Secure programming


Object
-
oriented programming


GUI development



Created by Larry
Wall in 1987


Designed as a glue
for Unix OS


Originally named
“PEARL”


Figure 1: Larry Wall


First Edition
published in 1991
as a reference
guide to Perl.


Previously,
documentation
was a single (very
long) man page.


Perl 4 released.

Figure 2: Programming Perl Cover

http://www.cpan.org/

Answer: Both


1.
Compiles into an intermediate format


Optimizes & gives instant feedback

2.
Interprets the intermediate format to
execute


#Comment


$number = “4”;


$string = “3 apples”;


@array = (“couch”, “movie”, “drink”);


%hash = (joe => ‘red’, sam => ‘blue’);




$a ** $b

#a^b


$a . $b

#String Concatenation


$a x $b

#Repeat a b times


$camels = ‘123’;


print $camels + 1;

# Prints 124




$a = “8”;


print $a + “1”;

# Prints 9


print $a . “1”;

# Prints 81



Open a text editor


Save with file extension .pl (or .cgi)






We’ve located the PERL interpreter and told
it we’re going to be working with a web
browser or in a web environment


Upload it to your web server


Run the program in one of three ways


Link to it


<a href=myscript.cgi>Click Here</a>


Write it into your HTML file


<p><!
--
#include virtual=“myscript.cgi”
--
>


Action item of a form


<form action=myscript.cgi>


Unix command line


perl myscript.cgi


Perl Code





HTML Code


Data Tracing Mechanism


Automatically determines which data was
derived from insecure sources


Specially Protected Compartments


Able to safely execute Perl code that may be
dangerous/insecure


Rotate Banners


Generate Text & HTML on the fly


Set Cookies


Provide Shopping Carts


Amazon.com


LiveJournal.com


Ticketmaster.com


IMDb.com


Writing poems that can actually be compiled
as legal Perl code.


if ((light eq dark) && (dark eq light)

&& ($blaze_of_night{moon} == black_hole)

&& ($ravens_wing{bright} == $tin{bright})){

my $love = $you = $sin{darkness} + 1;

};



Programming Perl

2
nd

Edition


http://websitehelpers.com/perl/


http://www.tizag.com/perlT/index.php


http://www.linuxjournal.com/article/3394


http://en.wikipedia.org/wiki/Larry_Wall


http://en.wikipedia.org/wiki/Perl


http://www.foo.be/docs/tpj/issues/vol5_1/t
pj0501
-
0012.html