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.  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
              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 2.0.22                                       2018-06-14                           GPG-PRESET-PASSPHRASE(1)