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.

       This program works with GnuPG 2 and later.  GnuPG 1.x is not supported.

       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).  Note that the maximum cache time as set with --max-cache-ttl  is
       still  honored.  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  --with-keygrip  --list-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).  Scripts should  always  use
       the option --with-colons, which provides the keygrip in a "grp" line (cf. ‘doc/DETAILS’)/

       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.