Section: GNU Privacy Guard (1)
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- Verify OpenPGP signatures
is an OpenPGP signature verification tool.
This program is actually a stripped-down version of gpg which is
only able to check signatures. It is somewhat smaller than the fully-blown
gpg and uses a different (and simpler) way to check that
the public keys used to make the signature are valid. There are
no configuration files and only a few options are implemented.
gpgv assumes that all keys in the keyring are trustworthy.
That does also mean that it does not check for expired or revoked
By default a keyring named 'trustedkeys.gpg' is used. This
default keyring is assumed to be in the home directory of GnuPG,
either the default home directory or the one set by an option or an
environment variable. The option --keyring may be used to
specify a different keyring or even multiple keyrings.
The program returns 0 if everything is fine, 1 if at least
one signature was bad, and other error codes for fatal errors.
recognizes these options:
Gives more information during processing. If used
twice, the input data is listed in detail.
Try to be as quiet as possible.
- --keyring file
Add file to the list of keyrings.
If file begins with a tilde and a slash, these
are replaced by the HOME directory. If the filename
does not contain a slash, it is assumed to be in the
home-directory ("~/.gnupg" if --homedir is not used).
- --status-fd n
Write special status strings to the file descriptor n. See the
file DETAILS in the documentation for a listing of them.
- --logger-fd n
Write log output to file descriptor n and not to stderr.
GnuPG normally checks that the timestamps associated with keys and
signatures have plausible values. However, sometimes a signature seems to
be older than the key due to clock problems. This option turns these
checks into warnings.
- --homedir dir
Set the name of the home directory to dir. If this option is not
used, the home directory defaults to '~/.gnupg'. It is only
recognized when given on the command line. It also overrides any home
directory stated through the environment variable 'GNUPGHOME' or
(on Windows systems) by means of the Registry entry
On Windows systems it is possible to install GnuPG as a portable
application. In this case only this command line option is
considered, all other ways to set a home directory are ignored.
To install GnuPG as a portable application under Windows, create an
empty file name 'gpgconf.ctl' in the same directory as the tool
'gpgconf.exe'. The root of the installation is than that
directory; or, if 'gpgconf.exe' has been installed directly below
a directory named 'bin', its parent directory. You also need to
make sure that the following directories exist and are writable:
'ROOT/home' for the GnuPG home and 'ROOT/var/cache/gnupg'
for internal cache files.
- gpgv pgpfile
- gpgv sigfile [datafile]
Verify the signature of the file. The second form is used for detached
signatures, where sigfile is the detached signature (either
ASCII-armored or binary) and datafile contains the signed data;
if datafile is "-" the signed data is expected on
stdin; if datafile is not given the name of the file
holding the signed data is constructed by cutting off the extension
(".asc", ".sig" or ".sign") from sigfile.
The default keyring with the allowed keys.
Used to locate the default home directory.
If set directory used instead of "~/.gnupg".
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
should give you access to the complete manual including a menu structure
and an index.
- RETURN VALUE
- SEE ALSO