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GPG-PRESET-PASSPHRASE(1)       GNU Privacy Guard      GPG-PRESET-PASSPHRASE(1)



NAME
       gpg-preset-passphrase - Put a passphrase into gpg-agent's cache

SYNOPSIS
       gpg-preset-passphrase [options] [command] keygrip


DESCRIPTION
       The  gpg-preset-passphrase is a utility to seed the internal cache of a
       running gpg-agent with passphrases.  It is mainly useful for unattended
       machines,  where  the  usual  pinentry  tool  may  not  be used and the
       passphrases for the to be used keys are given at machine startup.

       Passphrases set with this utility  don't  expire  unless  the  --forget
       option is used to explicitly clear them from the cache --- or gpg-agent
       is either restarted or reloaded (by sending a SIGHUP  to  it).   It  is
       necessary  to  allow  this  passphrase presetting by starting gpg-agent
       with the --allow-preset-passphrase.




       gpg-preset-passphrase is invoked this way:

         gpg-preset-passphrase [options] [command] keygrip

       keygrip is a 40 character string of hexadecimal characters  identifying
       the  key  for which the passphrase should be set or cleared.  This key-
       grip is listed along with the  key  when  running  the  command:  gpgsm
       --dump-secret-keys. One of the following command options must be given:


       --preset
              Preset a passphrase. This is what you usually will use. gpg-pre-
              set-passphrase will then read the passphrase from stdin.


       --forget
              Flush the passphrase for the given keygrip from the cache.



              The following additional options may be used:


       -v

       --verbose
              Output additional information while running.


       -P string

       --passphrase string
              Instead of reading the passphrase from stdin, use  the  supplied
              string as passphrase.  Note that this makes the passphrase visi-
              ble for other users.


SEE ALSO
       gpg(1), gpgsm(1), gpg-agent(1), scdaemon(1)

       The full documentation for this tool is maintained as a Texinfo manual.
       If  GnuPG and the info program are properly installed at your site, the
       command

         info gnupg

       should give you access to the complete manual including a  menu  struc-
       ture and an index.








GnuPG 2.0.9                       2008-10-04          GPG-PRESET-PASSPHRASE(1)