follow-up question on passphrase and script

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LEARN ABOUT CENTOS

gpg-preset-passphrase

GPG-PRESET-PASSPHRASE(1)					 GNU Privacy Guard					  GPG-PRESET-PASSPHRASE(1)

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 unat-
       tended 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							    2014-06-10						  GPG-PRESET-PASSPHRASE(1)

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