If you don't want someone booting your machine without permission, you can add a password to your GRUB entries. You can add a password only to specific entries if you wish; this will require a user to enter a password before loading only those boot entries you protect. This method very useful for your server security. But if u forgot your GRUB password you can proceed bellow steps.
01. Login as root
02. create an new encrypted password for grub
[root@srinivaslinux~]#grub-md5-crypt
Password: ****** (uddika)
Encrypted: $1$ZWnke0$1fzDBVjUcT1Mpdd4u/T961 (encrypted password)
03. copy the new encrypted password by highlighting it using the mouse
04. Open the grub configuration file for editing
05. Find this line
06. Replace with the following line (Right click the mouse to paste new password)
password --md5 $1$ZWnke0$1fzDBVjUcT1Mpdd4u/T961 (encrypted password above)
07. Save this file
08. Exit the file
01. Login as root
02. create an new encrypted password for grub
[root@srinivaslinux~]#grub-md5-crypt
Password: ****** (uddika)
Encrypted: $1$ZWnke0$1fzDBVjUcT1Mpdd4u/T961 (encrypted password)
03. copy the new encrypted password by highlighting it using the mouse
04. Open the grub configuration file for editing
[root@srinivaslinux~]#nano /etc/grub.conf
05. Find this line
password --md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/
06. Replace with the following line (Right click the mouse to paste new password)
password --md5 $1$ZWnke0$1fzDBVjUcT1Mpdd4u/T961 (encrypted password above)
07. Save this file
Ctrl + O
08. Exit the file
Ctrl + X
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