OReilly_Learning Perl 5th<Chapter 1 Introduction>

A Whirlwind Tour of Perl

> more hello.pl
#!/usr/local/bin/perl5.12.4
use utf8;
use warnings;
use diagnostics;
use 5.12.4;
say "Hello World ===> by say!";
print "Hello World ===> by print!\n";
> chmod u+x hello.pl
> ./hello.pl
Hello World ===> by say!
Hello World ===> by print!

> perl -e 'use 5.12.4;say "Hello World!"'
> perl -c ./hello.pl
./hello.pl syntax OK

> perldoc -u -f say
> perldoc -u diag
> perldoc -u faq
> perldoc -u perl
perl                Perl overview (this section)
> perldoc -u -q mail

1>: How Can I Get Perl? (CPAN is the Comprehensive Perl Archive Network)

2>: Is Perl Easy or Hard?

Perl is easy to use, but sometimes hard to learn..

3>: What's Perl Really Good For?

Perl is optimized for problems that are about 90% working with text and about 10% everything else.

My Friend's old notes: <http://marion.blog.51cto.com/all/22948/2>