1.查看用户信息的命令：id 参数 用户名
参数
-g 显示用户所属群组的ID
-u 显示用户ID
-G 显示用户所属附加群组的ID
执行id命令不加用户名，默认输出当前用户的ID信息
查看linzef用户的信息：
[root@master ~]# id linzef
uid=1000(linzef) gid=1000(oinstall) groups=1000(oinstall),1001(dba)
2.查看用户所在组的命令：groups 参数 用户名
查看linzef用户所在的组：
[root@master ~]# groups linzef
linzef : oinstall dba
3.查看当前登录用户命令：whoami
[root@master ~]# whoami
root
[root@master ~]# who am i
root pts/0 2023-11-07 17:42 (192.168.16.1)
4.查看当前用户命令w
[root@master ~]# w
18:11:51 up 31 min, 1 user, load average: 0.00, 0.01, 0.01
USER TTY LOGIN@ IDLE JCPU PCPU WHAT
root pts/0 17:42 7.00s 0.00s 0.00s w
5.查看登录用户命令：who
6.查看登录历史用户命令：last
[root@master ~]# last
root pts/0 192.168.16.1 Tue Nov 7 17:42 still logged in
reboot system boot 3.10.0-123.el7.x Tue Nov 7 17:40 - 18:14 (00:34)
root pts/0 192.168.16.1 Thu Oct 19 18:54 - crash (18+22:45)
reboot system boot 3.10.0-123.el7.x Thu Oct 19 18:54 - 18:14 (18+23:20)
root pts/0 192.168.16.1 Thu Oct 12 22:19 - crash (6+20:34)
root pts/0 192.168.16.1 Thu Oct 12 19:05 - 21:51 (02:46)
reboot system boot 3.10.0-123.el7.x Thu Oct 12 19:04 - 18:14 (25+23:10)
root pts/0 192.168.16.1 Mon Oct 9 23:12 - crash (2+19:52)
reboot system boot 3.10.0-123.el7.x Mon Oct 9 23:12 - 18:14 (28+19:02)
root pts/0 192.168.16.1 Sun Oct 8 21:50 - crash (1+01:21)
reboot system boot 3.10.0-123.el7.x Sun Oct 8 21:49 - 18:14 (29+20:25)
root pts/0 192.168.16.1 Thu Aug 31 16:45 - 16:46 (00:00)
reboot system boot 3.10.0-123.el7.x Thu Aug 31 16:45 - 18:14 (68+01:29)
reboot system boot 3.10.0-123.el7.x Thu Aug 31 16:45 - 16:45 (00:00)
root pts/0 192.168.16.1 Wed Aug 30 17:53 - crash (22:51)
root tty1 Wed Aug 30 17:52 - crash (22:52)
reboot system boot 3.10.0-123.el7.x Wed Aug 30 17:52 - 16:45 (22:53)
root pts/0 192.168.16.1 Wed Aug 30 17:47 - down (00:04)
root pts/0 192.168.16.1 Wed Aug 30 16:40 - 17:47 (01:06)
reboot system boot 3.10.0-123.el7.x Wed Aug 30 16:40 - 17:51 (01:11)
root pts/0 192.168.16.1 Mon Aug 28 21:52 - crash (1+18:48)
reboot system boot 3.10.0-123.el7.x Mon Aug 28 21:47 - 17:51 (1+20:03)
root pts/0 192.168.16.1 Mon Jul 24 21:01 - 00:28 (03:27)
root pts/2 192.168.16.1 Mon Jul 24 19:47 - 20:29 (00:42)
root pts/1 192.168.16.1 Mon Jul 24 19:21 - 19:47 (00:25)
root pts/1 192.168.16.1 Mon Jul 24 18:50 - 19:20 (00:30)
root pts/0 192.168.16.1 Mon Jul 24 17:05 - 20:59 (03:54)
reboot system boot 3.10.0-123.el7.x Mon Jul 24 17:04 - 17:51 (37+00:47)
root pts/0 192.168.16.1 Tue Jun 13 17:05 - crash (40+23:58)
root pts/0 192.168.16.1 Tue Jun 13 00:11 - 17:05 (16:53)
root pts/0 192.168.16.1 Tue Jun 13 00:11 - 00:11 (00:00)
root pts/1 192.168.16.1 Tue Jun 13 00:10 - 00:11 (00:01)
root pts/0 192.168.16.1 Tue Jun 13 00:00 - 00:10 (00:10)
root tty1 Mon Jun 12 23:51 - crash (41+17:13)
reboot system boot 3.10.0-123.el7.x Mon Jun 12 23:47 - 17:51 (78+18:04)
wtmp begins Mon Jun 12 23:47:41 2023
