给你的Linux或Unix控制台创造一棵圣诞树玩玩吧。在此之前，需要先安装一个Perl模块，命名为Acme::POE::Tree。这是一棵很喜庆的圣诞树，我已经在Linux、OSX和类Unix系统上验证过了。

安装 Acme::POE::Tree

安装perl模块最简单的办法就是使用CPAN（Perl综合典藏网（Comprehensive Perl Archive Network））。打开终端，把下面的指令敲进去便可安装Acme::POE::Tree。

### 以root身份运行 ###
perl -MCPAN -e 'install Acme::POE::Tree'

示例输出：

Installing /home/vivek/perl5/man/man3/POE::NFA.3pm
Installing /home/vivek/perl5/man/man3/POE::Kernel.3pm
Installing /home/vivek/perl5/man/man3/POE::Loop.3pm
Installing /home/vivek/perl5/man/man3/POE::Resource.3pm
Installing /home/vivek/perl5/man/man3/POE::Filter::Map.3pm
Installing /home/vivek/perl5/man/man3/POE::Resource::SIDs.3pm
Installing /home/vivek/perl5/man/man3/POE::Loop::IO_Poll.3pm
Installing /home/vivek/perl5/man/man3/POE::Pipe::TwoWay.3pm
Appending installation info to /home/vivek/perl5/lib/perl5/x86_64-linux-gnu-thread-multi/perllocal.pod
  RCAPUTO/POE-1.367.tar.gz
  /usr/bin/make install  -- OK
  RCAPUTO/Acme-POE-Tree-1.022.tar.gz
  Has already been unwrapped into directory /home/vivek/.cpan/build/Acme-POE-Tree-1.022-uhlZUz
  RCAPUTO/Acme-POE-Tree-1.022.tar.gz
  Has already been prepared
Running make for R/RC/RCAPUTO/Acme-POE-Tree-1.022.tar.gz
cp lib/Acme/POE/Tree.pm blib/lib/Acme/POE/Tree.pm
Manifying 1 pod document
  RCAPUTO/Acme-POE-Tree-1.022.tar.gz
  /usr/bin/make -- OK
Running make test
PERL_DL_NONLAZY=1 "/usr/bin/perl" "-MExtUtils::Command::MM" "-MTest::Harness" "-e" "undef *Test::Harness::Switches; test_harness(0, 'blib/lib', 'blib/arch')" t/*.t
t/01_basic.t .. ok
All tests successful.
Files=1, Tests=2,  6 wallclock secs ( 0.09 usr  0.03 sys +  0.53 cusr  0.06 csys =  0.71 CPU)
Result: PASS
  RCAPUTO/Acme-POE-Tree-1.022.tar.gz
Tests succeeded but one dependency not OK (Curses)
  RCAPUTO/Acme-POE-Tree-1.022.tar.gz
  [dependencies] -- NA

在Shell中显示圣诞树

只需要在终端上运行以下命令：

perl -MAcme::POE::Tree -e 'Acme::POE::Tree->new()->run()'

示例输出

Gif 01: 一棵用Perl写的喜庆圣诞树

树的定制

以下是我的脚本文件tree.pl的内容：

#!/usr/bin/perl

use Acme::POE::Tree;
my $tree = Acme::POE::Tree->new(
{
  star_delay => 1.5,  # shimmer star every 1.5 sec
  light_delay => 2,   # twinkle lights every 2 sec
  run_for => 10,      # automatically exit after 10 sec
}
);
$tree->run();

这样就可以通过修改stardelay、runfor和light_delay参数的值来自定义你的树了。一棵好玩的终端圣诞树就此诞生。