查看Linux系统最近重启命令
[root@localhost ~]# last reboot
reboot system boot 2.6.18-164.el5 Wed Dec 22 20:19 (12:58)
reboot system boot 2.6.18-164.el5 Wed Nov 10 10:41 (42+09:17)
reboot system boot 2.6.18-164.el5 Tue Oct 26 19:49 (14+14:42)
reboot system boot 2.6.18-164.el5 Fri Oct 22 00:22 (4+19:21)
reboot system boot 2.6.18-164.el5 Thu Oct 21 03:47 (5+15:56)
reboot system boot 2.6.18-164.el5 Wed Oct 20 23:43 (5+20:00)
reboot system boot 2.6.18-164.el5 Sat Sep 18 20:31 (37+23:12)
在2010-12-22 20：19重启了系统
可以看到正常命令重启显示为down，而电源强制重启为crash。
查看最近用户登录情况
[root@localhost ~]# last
Oracle pts/1 10.1.1.1 Thu Dec 23 08:59 still logged in
reboot system boot 2.6.18-164.el5 Wed Dec 22 20:19 (12:59)
root pts/1 10.1.1.2 Sun Dec 12 13:07 - 13:59 (00:52)
查看操作系统的历史命令：
[root@localhost ~]#history |more
382 top
383 df -lh
384 top
385 service iptables stop
386 last
387 last reboot
388 last
389 history
390 history |more
在执行top命令时都可以查看系统状态，然后就出现了reboot重启系统的状况。在service iptables stop命令之前没有查下到reboot的命令，可见是系统重启。
查看系统的日子信息：
[root@localhost ~]#cat /var/log/messages |more
Dec 20 02:46:56 localhost xinetd[5248]: EXIT: telnet status=1 pid=12350 duration
=30(sec)
Dec 22 19:59:12 localhost shutdown[32014]: shutting down for system halt
Dec 22 19:59:12 localhost pcscd: winscard.c:304:SCardConnect() Reader E-Gate 0 0
Not Found
Dec 22 19:59:13 localhost smartd[5472]: smartd received signal 15: Terminated
Dec 22 19:59:13 localhost smartd[5472]: smartd is exiting (exit status 0)
Dec 22 19:59:14 localhost avahi-daemon[5410]: Got SIGTERM, quitting.
Dec 22 19:59:14 localhost avahi-daemon[5410]: Leaving mDNS multicast group on in
terface usb0.IPv6 with address fe80::21:5eff:fe9c:b6d7.
Dec 22 19:59:14 localhost avahi-daemon[5410]: Leaving mDNS multicast group on in
terface eth0.IPv6 with address fe80::221:5eff:fe98:b6f4.
Dec 22 19:59:14 localhost avahi-daemon[5410]: Leaving mDNS multicast group on in
terface eth0.IPv4 with address 10.132.0.162.
Dec 22 20:21:08 localhost syslogd1.4.1: restart.
Dec 22 20:21:08 localhost kernel: klogd1.4.1, log source = /proc/kmsg started.
Dec 22 20:21:08 localhost kernel: Linux version2.6.18-164.el5 (mockbuild@x86-00
3.build.bos.RedHat.com) (gcc version 4.1.2 20080704 (Red Hat4.1.2-46)) #1 SMP T
ue Aug 18 15:51:48 EDT 2009
后经确认，这是在机房人为重启服务器。