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安装Perl

这是整个 Perl 教程的开始。

通过学习此教程，你将学会怎样在微软 Windows，Linux 和 Mac 操作系统上安装并使用Perl。以及，怎样搭建开发环境，简而言之，使用什么IDE或者编辑器写Perl程序。然后，学习“Hello, World”这一经典例子。

Windows

	#!/usr/bin/python3

	"""
	# phantom.py

	Simple but fully scriptable headless QtWebKit browser using PyQt5 in Python3,
	specialized in executing external JavaScript and generating PDF files. A lean
	replacement for other bulky headless browser frameworks.

	#!/usr/bin/env perl
	# mx.psgi -- get geographic information about a domain's mailservers

	# This was written purely as an example real-world-ish non-blocking
	# Plack/PSGI application because I'm sick of seeing the usual
	# "Hello World"-esque examples.

	# In one shell:
	# $ feersum --listen :5000 -a mx.psgi
	#

	#!/bin/bash

	HOST=$(hostname)

	function install_postfix() {
	echo \| sudo debconf-set-selections <<__EOF
	postfix postfix/root_address string
	postfix postfix/rfc1035_violation boolean false
	postfix postfix/mydomain_warning boolean
	postfix postfix/mynetworks string 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128