How to clear historical Command records and logon system records

1. Clear the records of successful login to the system, that is, the records displayed by the last command [root @ linuxzgf ~] Echovarlogwtmp this file is garbled by default when it is opened, and the ip address and other information verification processes can be seen in it [root @ linuxzgf ~] # Lastrootpts010.5.10.51ThuSep200: 59stillloggedinrootpts210. 5.10

1. Clear records of successful login to the system, that is, lastCommandRecord
[Root @ linuxzgf ~] Echo>/var/log/wtmp this file is garbled by default when it is opened, and the ip address and other information can be seen in it.

Verification process
[Root @ linuxzgf ~] # Last
Root pts/0 10.5.10.51 Thu Sep 2 00:59 still loggEdIn
Root pts/2 10.5.10.60 Wed Sep 1)
Root pts/2 10.5.10.60 Wed Sep 1)
Root pts/0 10.5.10.61 Wed Sep 1)
Root pts/3 10.5.10.59 Wed Sep 1)
Root pts/2 10.5.10.60 Wed Sep 1)
Root pts/1 10.5.10.191 Wed Sep 1)
.......................

[Root @ linuxzgf ~] # Echo>/var/log/wtmp
[Root @ linuxzgf ~] # Last

Wtmp begins Thu Sep 2 01:04:34 2010
[Root @ linuxzgf ~] #

The user logon information is invisible.

2. Clear the system logon failure record, that is, the record seen by the lastb command.
[Root @ linuxzgf ~] Echo>/var/log/btmp this file is garbled by default when it is opened

Verification Method
Run the following command before executing the command:
[Root @ linuxzgf ~] # Lastb
Root ssh: notty 10.5.10.60 Wed Sep 1)
Tty6 Mon Aug 30)
Tty6 Mon Aug 30)
Tty6 Mon Aug 30)
++ Tty6 Mon Aug 30)
Linuxzgf ssh: notty 10.5.10.60 Mon Aug 30)
Linuxzgf ssh: notty 10.5.10.60 Mon Aug 30)
.........

Then execute

[Root @ linuxzgf ~] # Echo>/var/log/btmp
[Root @ linuxzgf ~] # Lastb

Btmp begins Thu Sep 2 01:01:06 2010

No result is output.

Nice?

 

3. Clear history execution commands

[Root @ linuxzgf ~] History-c

Or

Clear the file in the user directory.
[Root @ linuxzgf ~]> ~ /. Bash_history