How to clear user logon records and command history using CentOS

Clear the records that have been successfully logged on to the system [root @ localhostroot] # echo & gt;/var/log/wtmp // garbled characters when this file is opened by default, ip address and other information can be found [root @ localhostroot] # last // at this time, the user login information cannot be found to clear the logon system failure record [root @ localhostroot Clear records of successful login to the system[Root @ localhost root] # echo>/var/log/wtmp // garbled characters when this file is opened by default, ip address and other information can be found [root @ localhost root] # last // user logon information cannot be found at this time
Clear records of system logon failures[Root @ localhost root] # echo>/var/log/btmp // garbled characters when this file is opened by default, you can find the logon failure information [root @ localhost root] # lastb // you cannot find the logon failure information. Clear History execution commands[Root @ localhost root] # history-c // run the [root @ localhost root] # echo>./. bash_history // or clear the file in the user directory. Import null history records[Root @ localhost root] # vi/root/history // create a record file [root @ localhost root] # history-c // clear the record [root @ localhost root] # history- r/root/history.txt // import record [root @ localhost root] # history // query the import result
Example[Root @ localhost root] # vi/root/history [root @ localhost root] # history-c [root @ localhost root] # history-r/root/history.txt [root @ localhost root] # history [root @ localhost root] # echo>/var/log/wtmp [root @ localhost root] # last [root @ localhost root] # echo>/var/log /btmp [root @ localhost root] # lastb [root @ localhost root] # history-c [root @ localhost root] # echo>. /. bash_history [root @ localhost root] # history