Changing Root password for Linux

 Changing Root password for Linux in single user mode.

Steps:

1. Select the kernel (Press ESC when Linux screen waits for 5 sec)

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:

                     OR

     # mount -t proc proc /proc

     # mount -o remount, rw /

9. Change the root password, enter:

    # passwd

Here it will ask for changing UNIX password.

10. Finally reboot system:

      # sync

      # reboot