w、who和users工具，是查询已登录当前主机的用户；另外finger -s 也同样能查询；侧重点不一样；请自己对比着看；毕竟简单，这里只是介绍 ；
[[email?protected] ~]$ w
12:09:56 up? 3:43,? 7 users,? load average: 0.16,0.10,0.04
USER???? TTY????? FROM????????????? [email?protected]?? IDLE?? JCPU?? PCPU WHAT
beinan?? tty1???? -??????????????? 08:27??? 3:42m? 3:09?? 0.00s /bin/sh /usr/X11R6/bin/startx
linuxsir tty2???? -??????????????? 10:03??? 2:06m? 0.01s? 0.01s -bash
beinan?? pts/0??? :0.0???????????? 11:36??? 1:09?? 0.15s? 0.15s bash
beinan?? pts/1??? :0.0???????????? 11:37??? 1:12?? 0.21s? 0.21s bash
beinan?? pts/2??? :0.0???????????? 12:02??? 6:52?? 0.09s? 0.09s bash
beinan?? pts/3??? :0.0???????????? 12:05?? 12.00s? 0.11s? 0.06s ssh xmbnnbdl[email?protected] -p 17007
beinan?? pts/4??? :0.0???????????? 12:06??? 0.00s? 0.21s? 0.00s w
[[email?protected] ~]$ who
beinan?? tty1???????? Nov? 2 08:27
linuxsir tty2???????? Nov? 2 10:03
beinan?? pts/0??????? Nov? 2 11:36 (:0.0)
beinan?? pts/1??????? Nov? 2 11:37 (:0.0)
beinan?? pts/2??????? Nov? 2 12:02 (:0.0)
beinan?? pts/3??????? Nov? 2 12:05 (:0.0)
beinan?? pts/4??????? Nov? 2 12:06 (:0.0)
[[email?protected] ~]$ users
beinan beinan beinan beinan beinan beinan linuxsir
