linux add password to grub2

1. run the command to create a password hash.

grub2-mkpasswd-pbkdf2

2. edit the following file like this

vi /etc/grub.d/01_users

#!/bin/sh -e

cat << EOF

    set superusers="root"

    password_pbkdf2 root grub.pbkdf2.sha512.10000.6A9A780AF06AFA821060956BC089B89A4F5A24F593268FED5DB42978EC7F956BD51FC7BB815B2ABF0BA8EC7F96DA7444B6254725505E06BED12C4AA97485CBFF.AF4A12B70E499340EF97720EF21434A55F1D124B9B9D062413314C8B554197235A525FD0F73C24FBDAF534F5A54CA576FDBF3456526A520BA5F087696B5F8047

EOF

3. apply the password to grub

grub2-mkconfig -o /boot/grub2/grub.cfg

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