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1. apache2安装完成之后，
配置文件位于/etc/apache2目录下，主要是apache2.conf。
但是修改的时候主要可以修改sites-available下面的default;
修改完成之后重启apache2，需要输入/etc/init.d/apache2之后添加参数stop, start, restart。
2. 修改apache2的配置文件使得其以cgi方式支持perl
修改sites-available下的default中的
设置目录/cgi-bin/对应的为/var/www/cgi-bin/（即http://localhost/cgi-bin/目录下为cgi脚 本）,同时修改AllowOverride, Options, Order, Allow等如上。另外还可以添加AddHandler cgi-script .cgi .pl，用以支持的后缀（默认情况下支持cgi和pl后缀）
3.编写cgi测试程序
cgi_test.pl
注意：
a. 需要将该cgi_test.pl程序copy到/var/www/cgi-bin/目录下
b. 还需要修改程序cgi_test.pl的权限，否则会出现如下类似错误：
(13)Permission denied: exec of ‘/var/www/cgi-bin/cgi.pl‘ failed
sudo chmod 755 cgi_test.pl
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