判断服务器最后一次启动是冷启动还是热启动
<p>last -x 显示系统关机，重新开机，以及执行等级的改变等信息。</p><p>下面是执行关机和重启之后执行last -x的结果:<br>
root pts/0 192.168.0.120 Fri Dec 21 14:15 still logged in<br>
root tty1 Fri Dec 21 14:02 still logged in<br>
runlevel (to lvl 3) 2.4.20-8 Fri Dec 21 13:59 – 14:15 (00:15)<br>
reboot system boot 2.4.20-8 Fri Dec 21 13:59 (00:15)<br>
shutdown system down 2.4.20-8 Fri Dec 21 13:59 – 14:15 (00:16)<br>
runlevel (to lvl 6) 2.4.20-8 Fri Dec 21 13:58 – 13:59 (00:00)<br>
root tty1 Fri Dec 21 13:58 – down (00:00)<br>
runlevel (to lvl 3) 2.4.20-8 Fri Dec 21 13:57 – 13:58 (00:01)<br>
reboot system boot 2.4.20-8 Fri Dec 21 13:57 (00:01)<br>
shutdown system down 2.4.20-8 Fri Aug 9 16:19 – 13:58 (-231+-2:-20<br>
runlevel (to lvl 0) 2.4.20-8 Fri Aug 9 16:18 – 16:19 (00:00)</p>
<p>wtmp begins Fri Aug 9 16:18:42 2002</p>
<p>运行级别0代表关机,6代表重启<br>
1、执行关机命令时首先会记录改变运行级别到0,然后记录关机<br>
shutdown system down 2.4.20-8 Fri Aug 9 16:19 – 13:58 (-231+-2:-20<br>
runlevel (to lvl 0) 2.4.20-8 Fri Aug 9 16:18 – 16:19 (00:00)<br>
2、（热启）执行重启命令时首先会记录改变运行级别到6,再记录关机,然后记录启动,最后记录改变运行级别为当前启动级别3<br>
runlevel (to lvl 3) 2.4.20-8 Fri Dec 21 13:59 – 14:15 (00:15)<br>
reboot system boot 2.4.20-8 Fri Dec 21 13:59 (00:15)<br>
shutdown system down 2.4.20-8 Fri Dec 21 13:59 – 14:15 (00:16)<br>
runlevel (to lvl 6) 2.4.20-8 Fri Dec 21 13:58 – 13:59 (00:00)<br>
3、（冷启）如果系统是冷启动则首先记录启动,然后记录改变运行级别为当前启动级别3<br>
runlevel (to lvl 3) 2.4.20-8 Fri Dec 21 13:57 – 13:58 (00:01)<br>
reboot system boot 2.4.20-8 Fri Dec 21 13:57 (00:01)</p>
<p>====><br>
热启动:<br>
runlevel (to lvl 3) 或 runlevel (to lvl 5)<br>
reboot system boot<br>
shutdown system down<br>
runlevel (to lvl 6)<br>
冷启动:<br>
runlevel (to lvl 3) 或 runlevel (to lvl 5)<br>
reboot system boot</p>
<p>因此区别冷启动还是热启动,可以获得last -x的输出后,<br>
判断reboot system boot 之后的第二行是runlevel (to lvl 6) 开头则是热启动,否则是冷启动</p>
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