Linux命令——w、who、whoami、lastlog、last

参考：Linux w Command Tutorial for Beginners (5 Examples)

Linux who Command Tutorial for Beginners (8 Examples)

Difference between who and whoami commands

w

Show who is logged on and what they are doing.

w无参数时的输出就已经包含足够多信息，参数只是限制输出某些信息。

w user_name 显示具体某人的信息

-h：Don't print the header.

-s（小写）：Use the short format.  Don't print the login time, JCPU or PCPU times.

-f：Toggle printing the from (remote hostname) field

who

show who is logged on

-b：time of last system boot

-d：print dead processes

-p（小写）：print active processes spawned by init

-q：all login names and number of users logged on

-r：print current runlevel

参数	说明
-a	打印能打印的全部
-d	打印死掉的进程
-m	同am i,mom likes
-q	打印当前登录用户数及用户名
-u	打印当前登录用户登录信息
-r	打印运行等级

whoami

这个命令没有参数，见名知意

直接执行whoami

也可以分开写

who am i