w命令
w命令查询utmp文件并显示当前系统中每个用户和它所运行的进程信息。例如，键入w命令，然后按回车键，将显示如下内容：
QUOTE:
3:36pm up 1 day, 22:34, 6 users, load average: 0.23, 0.29, 0.27
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
chyang pts/0 202.38.68.242 3:06pm 2:04 0.08s 0.04s -bash
ynguo pts/2 202.38.79.47 3:32pm 0.00s 0.14s 0.05 w
lewis pts/3 202.38.64.233 1:55pm 30:39 0.27s 0.22s -bash
lewis pts/4 202.38.64.233 1:35pm 6.00s 4.03s 0.01s sh /home/users/
ynguo pts/7 simba.nic.ustc.e 2:12pm 0.00s 0.47s 0.24s telnet mail
ylou pts/8 202.38.64.235 2:15pm 1:09m 0.10s 0.04s -bash
users命令
users命令用单独的一行打印出当前登录的用户，每个显示的用户名对应一个登录会话。如果一个用户有不止一个登录会话，那他的用户名将显示相同的次数。例如，键入users命令，然后按回车键，将显示如下内容：
QUOTE:
chyang lewis lewis ylou ynguo ynguo
last命令
last命令往回搜索wtmp来显示自从文件第一次创建以来登录过的用户。例如：
QUOTE:
chyang pts/9 202.38.68.242 Tue Aug 1 08:34 - 11:23 (02:49)
cfan pts/6 202.38.64.224 Tue Aug 1 08:33 - 08:48 (00:14)
chyang pts/4 202.38.68.242 Tue Aug 1 08:32 - 12:13 (03:40)
lewis pts/3 202.38.64.233 Tue Aug 1 08:06 - 11:09 (03:03)
lewis pts/2 202.38.64.233 Tue Aug 1 07:56 - 11:09 (03:12)
如果指明了用户，那么last只报告该用户的近期活动，例如，键入last ynguo命令，然后按回车键，将显示如下内容：
QUOTE:
ynguo pts/4 simba.nic.ustc.e Fri Aug 4 16:50 - 08:20 (15:30)
ynguo pts/4 simba.nic.ustc.e Thu Aug 3 23:55 - 04:40 (04:44)
ynguo pts/11 simba.nic.ustc.e Thu Aug 3 20:45 - 22:02 (01:16)
ynguo pts/0 simba.nic.ustc.e Thu Aug 3 03:17 - 05:42 (02:25)
ynguo pts/0 simba.nic.ustc.e Wed Aug 2 01:04 - 03:16 1+02:12)
ynguo pts/0 simba.nic.ustc.e Wed Aug 2 00:43 - 00:54 (00:11)
ynguo pts/9 simba.nic.ustc.e Thu Aug 1 20:30 - 21:26 (00:55)
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