if root user forget the password how to change it?

Question Posted / dk

4 Answers
15054 Views
Wipro, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

if root user forget the password how to change it?..

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

Is This Answer Correct ?

11 Yes

2 No

if root user forget the password how to change it?..

Answer / mrigendra singh

firstly reboot the system then when so grub loader screen
then select linux option by pressing up and down aero key.
then press e for edit,this line display three linse select
kernel option line i.e.
kernel /vmlinuz-2.6---------
then press once again (e),it will display grub edit promt
i.e grub edit>kernel/vmlinuz -------
at last above line give one space and then write 1 then
press enter and then press (b) to boot the os. Then
It will display single user shell prompt i.e
sh-3.2#passwd(written)
then provide new password.
then reboot

Is This Answer Correct ?

6 Yes

0 No

if root user forget the password how to change it?..

Answer / 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