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CentOS 7.0 - man page for gpg-preset-passphrase (centos section 1)

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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

       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 2.0.22				    2014-06-10			 GPG-PRESET-PASSPHRASE(1)

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