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/var/log/wtmp文件的作用

2015-06-05 10:44 302 查看
/var/log/wtmp是一个二进制文件，记录每个用户的登录次数和持续时间等信息
查看方法：
用last命令输出当中内容：
[root@mail log]# last
root     pts/0        192.168.80.117   Fri Jun  5 14:48   still logged in
root     tty1                          Fri Jun  5 14:48   still logged in
reboot   system boot  2.6.32-431.el6.x Fri Jun  5 14:47 - 15:50  (01:02)
root     pts/3        maweidong        Thu Jun  4 22:03 - down   (00:25)
root     pts/2        maweidong        Thu Jun  4 20:12 - down   (02:16)
root     pts/1        maweidong        Thu Jun  4 19:56 - down   (02:32)
root     pts/0        maweidong        Thu Jun  4 19:25 - 22:07  (02:41)
或者用last -f /var/log/wtmp
[root@mail log]# last -f wtmp
root     pts/0        192.168.80.117   Fri Jun  5 14:48   still logged in
root     tty1                          Fri Jun  5 14:48   still logged in
reboot   system boot  2.6.32-431.el6.x Fri Jun  5 14:47 - 15:39  (00:51)
root     pts/3        maweidong        Thu Jun  4 22:03 - down   (00:25)
root     pts/2        maweidong        Thu Jun  4 20:12 - down   (02:16)
root     pts/1        maweidong        Thu Jun  4 19:56 - down   (02:32)
root     pts/0        maweidong        Thu Jun  4 19:25 - 22:07  (02:41)
root     tty1                          Thu Jun  4 19:25 - down   (03:04)
或
[root@mail log]# who -u wtmp
root     tty1         2015-05-29 18:43 00:50        1019
root     pts/0        2015-05-29 18:51   .          2438 (maweidong)
root     pts/1        2015-05-29 20:35   ?          2613 (maweidong)
root     tty1         2015-05-29 21:44 00:50        1112
root     pts/0        2015-05-29 21:44   .          1216 (maweidong)
root     tty1         2015-06-01 16:17 00:50        1097
root     pts/0        2015-06-01 16:17   .          1204 (maweidong)
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