kazulog@sv1:~$ cd /tmp
kazulog@sv1:/tmp$ sudo -s
root@sv1:/tmp# whoami
root
root@sv1:/tmp# pwd
/tmp
root@sv1:/tmp# echo $HOME
/root
root@sv1:/tmp# exit
exit
kazulog@sv1:/tmp$ sudo -i
root@sv1:~# whoami
root
root@sv1:~# pwd
/root
root@sv1:~# echo $HOME
/root
root@sv1:~# exit
logout
kazulog@sv1:/tmp$ cd
kazulog@sv1:~$ sudo passwd -S root
root L 2026-08-23 0 99999 7 -1
kazulog@sv1:~$ sudo grep '^root:' /etc/shadow
root:*:20688:0:99999:7:::
kazulog@sv1:~$ su -
Password: 
su: Authentication failure
kazulog@sv1:~$ sudo passwd root
New password: 
Retype new password: 
passwd: password updated successfully
kazulog@sv1:~$ sudo passwd -S root
root P 2026-09-10 0 99999 7 -1
kazulog@sv1:~$ su -
Password: 
root@sv1:~# whoami
root
root@sv1:~# exit
logout
kazulog@sv1:~$ sudo sshd -T | grep -i permitrootlogin
permitrootlogin prohibit-password