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.

       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 a passphrase. This is what you usually will use. gpg-pre-
              set-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 visi-
              ble 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

         info gnupg

       should  give  you access to the complete manual including a menu struc-
       ture and an index.

GnuPG 2.2.4                       2017-12-18          GPG-PRESET-PASSPHRASE(1)
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