Example of clearing logging and history in CentOS

Clear log of Successful login system

[Root@localhost root]# echo >/var/log/wtmp//This file is open by default garbled, can be traced to IP and other information
[Root@localhost root]# last//The user login information is not found at this time

Clear logging of failed login system

[Root@localhost root]# echo >/var/log/btmp//This file is open by default garbled, can be traced to login failure information
[Root@localhost root]# LASTB//Failed to find login failure information

Clear History Execution Command

[Root@localhost root]# history-c//Empty History Execution command
[Root@localhost root]# echo >/.bash_history//or clear this file in the user directory

Import Empty History

[Root@localhost root]# vi/root/history//new record file
[Root@localhost root]# history-c//purge record
[Root@localhost root]# history-r/root/history.txt//Import Records
[Root@localhost root]# History//Query Import Results

Instance

Clears the logging of the login system, which is what the last command saw.

This file is opened by default garbled, which can see the IP and so on information

Echo >/var/log/wtmp
Last

The user logon information is not visible at this time

Clears the log of the login system failure, which is the record that the LASTB command sees.
The file is garbled when it is opened by default

echo >/var/log/btmp
Lastb

There's no output at this point.

Clear History Execution Command

History-c

Or, empty the file in the user's directory

Echo >~/.bash_history

Add

[Root@localhost root]# echo >/var/log/wtmp This file is turned on by default when it's garbled, and you can see IP and so on.

[Root@localhost root]# Echo >/var/log/wtmp

[Root@localhost root]# last

The user logon information is not visible at this time

Clears the log of the login system failure, which is the record that the LASTB command sees.

[Root@localhost root]# echo >/var/log/btmp This file is open by default when it is garbled

[Root@localhost root]# echo >/var/log/btmp

[Root@localhost root]# Lastb

There's no output at this point.

Clear History Execution Command

[Root@localhost root]# History-c

Or, empty the file in the user's directory

[Root@localhost root]# echo >/.bash_history