怎么样删除登录Ubuntu Linux提示的Last login信息?

登录一台Ubuntu Linux系统,会提示上一次的登录信息:

Last login: Wed Jan 24 09:49:29 2018 from 25.68.xx.xx

因为不想让人知道我登录过,所以要禁掉这些信息:

vi /etc/ssh/sshd_config
修改PrintLastLog yes
为:
PrintLastLog no

[email protected]:~# service ssh restart
[email protected]:~# cat /dev/null > /var/log/wtmp
[email protected]:~# cat /dev/null > /root/.bash_history
[email protected]:~# cat /dev/null > /root/.bashrc
[email protected]:~# cat /dev/null > /root/.mysql_history
[email protected]:~# history -c

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