Clearing Linux login logs with last and lastb
Since permissions may vary by Linux distribution, you can check with.
GGAMI
sudo rm -f /var/log/wtmp /var/log/btmp
sudo touch /var/log/wtmp /var/log/btmp
sudo chown root:utmp /var/log/wtmp /var/log/btmp
sudo chmod 664 /var/log/wtmp