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grub: trust

 
 16.3.76 trust
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  -- Command: trust [--skip-sig] pubkey_file
      Read public key from PUBKEY_FILE and add it to GRUB's internal list
      of trusted public keys.  These keys are used to validate digital
      signatures when environment variable 'check_signatures' is set to
      'enforce'.  Note that if 'check_signatures' is set to 'enforce'
      when 'trust' executes, then PUBKEY_FILE must itself be properly
      signed.  The '--skip-sig' option can be used to disable
      signature-checking when reading PUBKEY_FILE itself.  It is expected
      that '--skip-sig' is useful for testing and manual booting.  ⇒
      Using digital signatures, for more information.
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