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] cache-id


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] cacheid

       cacheid is either a 40 character keygrip of hexadecimal characters identifying the key for which the passphrase should be
       set or cleared.  The keygrip is listed along with the key when running the command: gpgsm  --dump-secret-keys.   Alterna-
       tively  an arbitrary string may be used to identify a passphrase; it is suggested that such a string is prefixed with the
       name of the application (e.g foo:12346).


       One of the following command options must be given:


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


       --forget
              Flush the passphrase for the given cache ID 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 visible 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 structure and an index.








GnuPG 2.0.18                                               2011-09-20                                   GPG-PRESET-PASSPHRASE(1)