The chkconfig command can be used with grep to determine the run levels in which sendmail will run. Here we see it will run at levels 3 and 5.

• 命令行工具和文档搜索工具的配合使用可以让你决定邮件服务器的运行等级.；下面的命令可以让邮件服务器运行在3级和5级