whoami,who,w命令详解

http://www.voidcn.com/blog/wszzdanm/article/p-6145895.html

命令功能：显示登录用户的信息

命令格式：

常用选项：

举例：

w 显示已经登录的用户及正在进行的操作

[root@localhost ~]# w

11:22:01 up 4 days, 21:22,  3 users,  load average: 0.00, 0.00, 0.00

USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT

root     tty1     -                Thu14    4days  0.19s  0.19s -bash

root     pts/0    172.31.3.32      Thu14    0.00s  0.73s  0.00s w

root     pts/1    172.31.3.32      11:18    1:50   0.07s  0.02s -bash

who 显示已经登录的用户名、终端名称、登录时间及登录IP

[root@localhost ~]# who

root     tty1         2015-11-12 14:00

root     pts/0        2015-11-12 14:03 (172.31.3.32)

root     pts/1        2015-11-17 11:18 (172.31.3.32)

whoami 显示当前用户的用户名

[zzd@localhost ~]$ whoami

zzd

who am i 显示登录系统的时候的用户名，即使已经切换到其他用户也显示登录时的用户

结果同who -m

[zzd@localhost ~]$ whoami

zzd

[zzd@localhost ~]$ who am i

root     pts/1        2015-11-17 11:18 (172.31.3.32)

[zzd@localhost ~]$ who -m

root     pts/1        2015-11-17 11:18 (172.31.3.32)

显示当前用户

w  //显示当前用户，不显示登录位置
19:50:14 up 9:27, 4 users, load average: 0.31, 0.26, 0.18
USER   TTY   FROM       LOGIN@  IDLE  JCPU  PCPU WHAT
root   tty7   :0        Thu12  31:39m 10:10  0.60s gnome-session
root   pts/0  :0.0       17:09  2:18m 15.26s 0.15s bash
root   pts/1  192.168.1.17   18:51  1.00s 1.24s 0.14s -bash
root   pts/2  192.168.1.17   19:48  60.00s 0.05s 0.05s -bash

不显示登录位置

w -f
19:53:59 up 9:31, 4 users, load average: 0.05, 0.16, 0.15
USER   TTY    LOGIN@  IDLE  JCPU  PCPU WHAT
root   tty7   Thu12  31:43m 10:10  0.60s gnome-session
root   pts/0   17:09  2:21m 15.26s 0.15s bash
root   pts/1   18:51  0.00s 1.04s 0.14s -bash
root   pts/2   19:48  4:45  0.05s 0.05s -bash

以精简模式显示

w -s
19:54:37 up 9:31, 4 users, load average: 0.24, 0.19, 0.16
USER   TTY   FROM        IDLE WHAT
root   tty7   :0        31:43m gnome-session
root   pts/0  :0.0       2:22m bash
root   pts/1  192.168.1.17   0.00s -bash
root   pts/2  192.168.1.17   5:23 -bash

不显示标题

w -h
root   tty7   :0        Thu12  31:44m 10:10  0.60s gnome-session
root   pts/0  :0.0       17:09  2:23m 15.26s 0.15s bash
root   pts/1  192.168.1.17   18:51  0.00s 1.05s 0.14s -bash
root   pts/2  192.168.1.17   19:48  5:54  0.05s 0.05s -bash

yexiang@ubuntu:<sboot>$ w -u yexiang
 14:02:04 up 9 days,  4:40,  3 users,  load average: 0.99, 1.25, 0.99
USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
yexiang  pts/1    10.0.4.198       10:19    3.00s  0.19s  0.00s w -u yexiang