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.