<span style="color: rgb(31, 41, 55); font-family: "Source Sans 3", "PingFang SC", "Microsoft YaHei", sans-serif; font-size: 16.64px;">halt命令用来关闭正在运行的Linux操作系统，如果是线上跑了业务的服务器，执行此命令需谨慎。</span><br style="scrollbar-width: none; color: rgb(31, 41, 55); font-family: "Source Sans 3", "PingFang SC", "Microsoft YaHei", sans-serif; font-size: 16.64px;"><span style="color: rgb(31, 41, 55); font-family: "Source Sans 3", "PingFang SC", "Microsoft YaHei", sans-serif; font-size: 16.64px;">halt命令会先检测系统的runlevel，若runlevel为0或6，则关闭系统，否则即调用shutdown来关闭系统。</span>