if root user forget the password how to change it?

Answer Posted / ajit mohan b

You can reset forgotten root password under Linux by booting
system into single user mode or emergency mode (also known
as rescue mode).

Following is the procedure to reset root password if you are
using GRUB as a boot loader:

1.Select the kernel
2.Press the e key to edit the entry
3.Select second line (the line starting with the word kernel)
4.Press the e key to edit kernel entry so that you can
append single user mode
5.Append the letter S (or word Single) to the end of the
(kernel) line
6.Press ENTER key
7.Now press the b key to boot the Linux kernel into single
user mode
8.At prompt type passwd command to reset password:
You need to mount at least / and other partitions:
# mount -t proc proc /proc
# mount -o remount,rw /

Change the root password, enter:
# passwd
Finally reboot system:
# sync
# reboot

Boot loader is LILO:

At LILO boot loader type linux single and press [ENTER] key:
Boot: linux single

When you get the # prompt you will need to type passwd root
to reset password:
# passwd

Reboot system:
# sync
# reboot

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