View logged-on users and disconnected users in Centos

View the users in the system: cut-d:-f 1/etc/passwd
View users who can log on to the system: cat/etc/passwd | grep-v/sbin/nologin | cut-d:-f 1
View user operations: w command (root permission required)
View a User: w user name
View logon User: who
View user logon history: last

Example

1. View login users

The code is as follows:	Copy code
[Root @ linux tmp] # w 18:00:52 up 2 days, 1 user, load average: 0.00, 0.00, 0.00 User tty from login @ IDLE JCPU PCPU WHAT Dekeha pts/3 121.12.149.106 46: 42 12.26 s 0.01 s-bash

2. Log out of the logged-on user

The code is as follows:	Copy code
Pkill-kill-t pts/3

3. Check whether the user is logged out.

The code is as follows:	Copy code
[Root @ linux tmp] # w 18:02:33 up 2 days, 0 users, load average: 0.00, 0.00, 0.00 User tty from login @ IDLE JCPU PCPU WHAT