我last在 RHEL的命令输出中看到一个可疑的模式：
$ last reboot
reboot system boot 3.10.0-514.21.1. Wed Dec 13 10:25 - 11:53 (01:28)
reboot system boot 3.10.0-514.21.1. Mon Oct 30 16:23 - 11:53 (43+20:30)
reboot system boot 3.10.0-514.21.1. Fri Oct 20 16:53 - 11:53 (53+20:00)
reboot system boot 3.10.0-514.21.1. Mon Oct 16 09:21 - 11:53 (58+03:32)
reboot system boot 3.10.0-514.21.1. Fri Aug 25 15:53 - 11:53 (109+21:00)
reboot system boot 3.10.0-514.21.1. Tue Aug 22 15:36 - 11:53 (112+21:16)
reboot system boot 3.10.0-514.21.1. Fri Jul 21 …last ×1