This series article that are learning note for Learning Perl by Randal L. Schwartz, brian d foy, and Tom Phoenix published by O’REILLY.
#Perl 1. Introduction
###What’s Perl Really Good For? Perl is optimized for problems which are about 90% working with text.
###What Is Perl Not Good For? You shouldn’t choose Perl if you’re trying to make an opaque binary.
###What is CPAN? CPAN is the Comprehensive Perl Archive Network, your one-stop shopping for Perl.
###Are There Any Other Kinds of Support? http://www.pm.org/ http://perldoc.perl.org/ http://learn.perl.org/faq/ http://perlmonks.org/ http://learn.perl.org/
###A Simple Program
create and edit a text file
$ vi my_program
#!/usr/bin/perl
print "Hello, world!\n";
apply permissions:
chmod a+x my_program
finally run
$ ./my_program
There’s another way to write this simple program in Perl 5.10 or later.
Instead of print, we use say, which does almost the same thing ,but with less typing.
Since it’s a new feather and you might not using Perl 5.10 yet, we include 5.010 statement that tells Perl that we used new feathers:
#!/usr/bin/perl
use 5.010;
say "Hello, world!";
This book covers up to Perl 5.14, so in many of the new features we preface the examples to remind you to add this line:
use 5.014;
###How Do I Compile My Perl Program?
Just run your Perl program. The perl interpreter compiles and runs your program in one user step:
$ perl my_program