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.
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 --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-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.
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
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