NAME

       gpgv - Verify OpenPGP signatures

SYNOPSIS

       gpgv [options] signed_files

DESCRIPTION

       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.

       If   no   --keyring   option  is  given,  gpgv  looks  for  a  ``default''  keyring  named
       ‘trustedkeys.kbx’ (preferred) or ‘trustedkeys.gpg’ in the home directory of GnuPG,  either
       the  default  home  directory  or  the  one  set  by the --homedir option or the GNUPGHOME
       environment variable.  If any --keyring option is used, gpgv will not look for the default
       keyring.  The  --keyring option may be used multiple times and all specified keyrings will
       be used together.

RETURN VALUE

       The program returns 0 if everything is fine, 1 if at least  one  signature  was  bad,  and
       other error codes for fatal errors.

OPTIONS

       gpgv recognizes these options:

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

       --quiet
       -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).

       --output file
       -o file
              Write output to file; to write to stdout use -.  This option can be used to get the
              signed  text  from  a  cleartext  or  binary  signature; it also works for detached
              signatures, but in that case this option is in general not useful.   Note  that  an
              existing file will be overwritten.

       --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.

       --log-file file
              Same as --logger-fd,  except  the  logger  data  is  written  to  file  file.   Use
              ‘socket://’ to log to socket.

       --ignore-time-conflict
              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
              named ‘gpgconf.ctl’ in the same directory as the tool ‘gpgconf.exe’.  The  root  of
              the  installation  is  then 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.

       --enable-special-filenames
              This  option enables a mode in which filenames of the form ‘-&n’, where n is a non-
              negative decimal number, refer to the file descriptor n and not to a file with that
              name.

EXAMPLES

       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.

FILES

       ~/.gnupg/trustedkeys.gpg
              The default keyring with the allowed keys.

ENVIRONMENT

       HOME   Used to locate the default home directory.

       GNUPGHOME
              If set directory used instead of "~/.gnupg".

SEE ALSO

       gpg(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.