对应/var/log/wtmp数据文件
例：
[root@oldboy /]# last
oldboy pts/1 192.168.126.1 Mon Feb 24 06:36 still logged in
oldboy pts/1 192.168.126.1 Mon Feb 17 03:42 - 09:56 (06:14)
oldboy pts/2 192.168.126.1 Mon Feb 17 03:39 - 03:42 (00:02)
oldboy pts/1 192.168.126.1 Mon Feb 17 03:32 - 03:41 (00:09)
oldboy pts/0
92.168.126.1 Sun Feb 16 17:01 - 17:01 (00:00)
oldboy pts/0 192.168.126.1 Sun Feb 16 17:00 - 17:08 (00:08)
root pts/0 192.168.126.1 Sun Nov 17 21:44 - 00:05 (02:20)
root tty1 Sun Nov 17 20:31 - crash (28+13:09)
reboot system boot 2.6.32-573.el6.x Sun Nov 17 20:31 - 16:55 (90+20:23)
root tty1 Sun Nov 17 20:27 - crash (00:03)
reboot system boot 2.6.32-573.el6.x Sun Nov 17 20:26 - 16:55 (90+20:29)
wtmp begins Sun Nov 17 20:26:11 2019
[root@oldboy /]#