There are a couple of reasons why you might want to reset a Linux root password. If the current password is known to you, just log in as root and issue the passwd command. What if you’ve forgotten the password and can’t log in? Resetting a Linux root password is simple if you have access to the machine. There are 2 main methods.
First, we boot the machine up. If LILO is in use, enter linux init=/bin/bash at the ‘LILO:’ prompt. If GRUB is in use, then press key ‘e’. We’ll need to edit the kernel line, beginning ‘linux’, and append init=/bin/sh: