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GPGV2(1)		     GNU Privacy Guard 2.2		      GPGV2(1)

       gpgv2 - Verify OpenPGP signatures

       gpgv2 [options] signed_files

       gpgv2 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.

       gpgv2  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.

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

       gpgv2 recognizes	these options:

       -v     Gives more information during processing.	If used	twice, the in-
	      put 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).

       --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	signa-
	      ture;  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.

	      GnuPG  normally  checks that the timestamps associated with keys
	      and signatures have plausible values. However, sometimes a  sig-
	      nature  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 en-
	      try 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 con-
	      sidered, 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  be-
	      low  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.

	      This option enables a mode in which filenames of the form	`-_n',
	      where  n is a non-negative decimal number, refer to the file de-
	      scriptor n and not to a file with	that name.

       gpgv2 pgpfile
       gpgv2 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	struc-
       ture and	an index.

GnuPG 2.2.22			  2020-08-30			      GPGV2(1)


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