GPGV(1)                      GNU Privacy Guard 1.4                     GPGV(1)


       gpgv - Verify OpenPGP signatures


       gpgv [options] signed_files


       gpgv 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 keys.

       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.


       gpgv recognizes these options:


       -v     Gives more information during processing. If used twice, the
              input data is listed in detail.


       -q     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 HKCU\Software\GNU\GnuPG:HomeDir.

              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.

       --weak-digest name
              Treat the specified digest algorithm as weak.  Signatures made
              over weak digests algorithms are normally rejected. This option
              can be supplied multiple times if multiple algorithms should be
              considered weak.  MD5 is always considered weak, and does not
              need to be listed explicitly.


       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.


       HOME   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

         info gnupg

       should give you access to the complete manual including a menu
       structure and an index.

GnuPG 1.4.23                      2018-10-12                           GPGV(1)

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