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

       gpg-preset-passphrase [options] [command] cache-id

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

              Flush the passphrase for the given cache ID from the cache.

              The following additional options may be used:


              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.

       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 2.0.14                      2014-06-30          GPG-PRESET-PASSPHRASE(1)