清除登陸系統成功的記錄

[[email protected] root]# echo > /var/log/wtmp //此檔案預設開啟時亂碼，可查到ip等資訊

[[email protected] root]# last //此時即查不到使用者登入資訊

清除登陸系統失敗的記錄

[[email protected] root]# echo > /var/log/btmp //此檔案預設開啟時亂碼，可查到登陸失敗資訊

[[email protected] root]# lastb //查不到登陸失敗資訊

清除歷史執行命令

[[email protected]

[[email protected] root]# echo > ./.bash_history //或清空使用者目錄下的這個檔案即可

匯入空歷史記錄

[[email protected] root]# vi /root/history //新建記錄檔案

[[email protected] root]# history -c //清除記錄 

[[email protected] root]# history -r /root/history.txt //匯入記錄 

[[email protected]

example 

[[email protected] root]# vi /root/history

[[email protected] root]# history -c 

[[email protected] root]# history -r /root/history.txt 

[[email protected] root]# history 

[[email protected] root]# echo > /var/log/wtmp  

[[email protected] root]# last

[[email protected] root]# echo > /var/log/btmp

[[email protected] root]# lastb 

[[email protected] root]# history -c 

[[email protected]ocalhost root]# echo > ./.bash_history

[[email protected] root]# history