查看当前已登入Linux系统的用户

[*****@*****~]$ w

输出类似于↓

21:27:26 up 21 min, 1 user, load average: 0.16, 0.38, 0.31
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
*** pts/0 10.99.168.10 21:12 6.00s 0.03s 0.01s w