// Apache
//Task: Start Apache 2 Server /启动apache服务
# /etc/init.d/apache2 start
//or
$ sudo /etc/init.d/apache2 start
//Task: Restart Apache 2 Server /重启apache服务
# /etc/init.d/apache2 restart
//or
$ sudo /etc/init.d/apache2 restart
//Task: Stop Apache 2 Server /停止apache服务
# /etc/init.d/apache2 stop
//or
$ sudo /etc/init.d/apache2 stop 
// Mysql
/etc/init.d/mysql start
/etc/init.d/mysql stop
/etc/init.d/mysql restart

// httpd是Apache超文本传输协议(HTTP)服务器的主程序。被设计为一个独立运行的后台进程，它会建立一个处理请求的子进程或线程的池。
// 通常，httpd不应该被直接调用，而应该在类Unix系统中由 apachectl 调用
// man apache2 中介绍
// apache2 is the Apache HyperText Transfer Protocol (HTTP) server program.
// It is designed to be run as a standalone daemon process. When used like
// this it will create a pool of child processes or threads to handle requests.
// In general, apache2 should not be invoked directly,
// but rather should be invoked via /etc/init.d/apache2 or apache2ctl.
// The default Debian config-uration requires environment variables
// that are defined in /etc/apache2/envvars and are not available if apache2 is started directly.
// However,apache2ctl can be used to pass arbitrary arguments to apache2.
//
// apache2ctl = apache2 ConTroL
//
apache2ctl -restart
apache2ctl -stop
apache2ctl -t
// 详细见 man apache2