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(grub.info)lock

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lock
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 - Command: lock
     Prevent normal users from executing arbitrary menu entries. You
     must use the command `password' if you really want this command to
     be useful (Note: password).

     This command is used in a menu, as shown in this example:

          title This entry is too dangerous to be executed by normal users
          lock
          root (hd0,a)
          kernel /no-security-os

     See also Note: Security.