id 用戶名 能看用戶屬於哪個組
id phq
uid=1000(phq) gid=1000(phq) groups=1000(phq),4(adm),20(dialout),24(cdrom),46(plugdev),105(lpadmin),119(admin),122(sambashare),123(vboxusers)
more /etc/passwd 也能看用戶屬於哪個組，缺省shell等信息但不那麼直觀
finger 用戶名 出來的更直觀些，而且糅合了‘w'命令的結果
finger phq
Login: phq Name: phq
Directory: /home/phq Shell: /bin/bash
On since Wed Nov 14 08:57 (CST) on tty7 from :0
2 hours 37 minutes idle
On since Wed Nov 14 08:58 (CST) on pts/0 from :0.1
1 hour 58 minutes idle
On since Wed Nov 14 09:03 (CST) on pts/1 from :0.1
43 minutes 37 seconds idle
On since Wed Nov 14 11:23 (CST) on pts/3 from :0.1
No mail.
No Plan.
groups 能看系統的組
w
/usr/local$ w
11:35:49 up 2:38, 4 users, load average: 0.82, 0.92, 0.91
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
penghong tty7 :0 08:57 2:38m 3:22 0.11s gnome-session
penghong pts/0 :0.1 08:58 1:59m 0.80s 0.59s vim
penghong pts/1 :0.1 09:03 44:39 0.22s 0.22s bash
penghong pts/3 :0.1 11:23 0.00s 0.21s 0.01s w
who是w的簡化版