To make files immutable

chattr +i king.txt

To get Persistence king.txt

while :; do chattr -i king.txt ; echo 'nickapic' > king.txt ; chattr +i king.txt ; done & 

To get Persistence

Put your id_rsa.pub in the autorized_keys folder in the /root/.ssh/authorized keys

To kick all people

First see your tty session by doing tty and then do ps aux | grep pts and then we can try to kill the process with the pts sessions that our not ours.

ps aux | grep pts

ps -eaf -forestw\\