gnupg/doc/gpgv.sgml

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<!DOCTYPE refentry PUBLIC "-//Davenport//DTD DocBook V3.0//EN" [
<!entity ParmDir "<parameter>directory</parameter>">
<!entity ParmFile "<parameter>file</parameter>">
<!entity OptParmFile "<optional>&ParmFile;</optional>">
<!entity ParmFiles "<parameter>files</parameter>">
<!entity OptParmFiles "<optional>&ParmFiles;</optional>">
<!entity ParmNames "<parameter>names</parameter>">
<!entity OptParmNames "<optional>&ParmNames;</optional>">
<!entity ParmName  "<parameter>name</parameter>">
<!entity OptParmName  "<optional>&ParmName;</optional>">
<!entity ParmKeyIDs "<parameter>key IDs</parameter>">
<!entity ParmN	    "<parameter>n</parameter>">
<!entity ParmFlags  "<parameter>flags</parameter>">
<!entity ParmString "<parameter>string</parameter>">
<!entity ParmValue  "<parameter>value</parameter>">
<!entity ParmNameValue	"<parameter>name=value</parameter>">
]>

<refentry id="gpgv">
<refmeta>
  <refentrytitle>gpgv</refentrytitle>
  <manvolnum>1</manvolnum>
  <refmiscinfo class="gnu">GNU Tools</refmiscinfo>
</refmeta>
<refnamediv>
  <refname/gpgv/
  <refpurpose>signature verification tool</>
</refnamediv>
<refsynopsisdiv>
  <synopsis>
<command>gpgv</>
 <optional><parameter/options/</optional>
 <optional><parameter/signed files/</optional>
  </synopsis>
</refsynopsisdiv>

<refsect1>
    <title>DESCRIPTION</title>
    <para>
<command/gpgv/ is the OpenPGP signature checking tool.
    </para>
    <para>
This program is a stripped down version of <command/gpg/ which is only
able
to check signatures.  It is somewhat smaller than the full blown
<command/gpg/ and uses a different (and more simple way) to check that
the public keys used to made the signature are trustworth.  There is
no options files and only very few options are implemented.
</para>
<para>
<command/gpgv/ assumes that all keys in the keyring are trustworty.
It uses by default a keyring named <filename/trustedkeys.gpg/ which is
assumed to be in the home directory as defined by GnuPG or set by an
option or an environment variable.  An option may be used to specify
another keyring or even multiple keyrings.
</para>
</refsect1>

<refsect1>
<title>OPTIONS</title>
<para>
<command/gpgv/ recognizes these options:
</para>

<variablelist>


<varlistentry>
<term>-v, --verbose</term>
<listitem><para>
Give more information during processing. If used
twice, the input data is listed in detail.
</para></listitem></varlistentry>


<varlistentry>
<term>-q, --quiet</term>
<listitem><para>
Try to be as quiet as possible.
</para></listitem></varlistentry>


<varlistentry>
<term>--keyring &ParmFile;</term>
<listitem><para>
Add &ParmFile to the list of keyrings.
If &ParmFile 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).
The filename may be prefixed with a scheme:</para>
<para>"gnupg-ring:" is the default one.</para>
<para>It might make sense to use it together with --no-default-keyring.
</para></listitem></varlistentry>


<varlistentry>
<term>--homedir &ParmDir;</term>
<listitem><para>
Set the name of the home directory to &ParmDir; If this
option is not used it defaults to "~/.gnupg". It does
not make sense to use this in a options file. This
also overrides the environment variable "GNUPGHOME".
</para></listitem></varlistentry>


<varlistentry>
<term>--status-fd &ParmN;</term>
<listitem><para>
Write special status strings to the file descriptor &ParmN;.
See the file DETAILS in the documentation for a listing of them.
</para></listitem></varlistentry>


<varlistentry>
<term>--logger-fd &ParmN;</term>
<listitem><para>
Write log output to file descriptor &ParmN; and not to stderr.
</para></listitem></varlistentry>


<varlistentry>
<term>--ignore-time-conflict</term>
<listitem><para>
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 makes these
checks just a warning.
</para></listitem></varlistentry>


</variablelist>
</refsect1>


<refsect1>
    <title>RETURN VALUE</title>
    <para>
The program returns 0 if everything was fine, 1 if at least
one signature was bad, and other error codes for fatal errors.
    </para>
</refsect1>

<refsect1>
    <title>EXAMPLES</title>
    <variablelist>

<varlistentry>
<term>gpgv <parameter/pgpfile/</term>
<term>gpgv <parameter/sigfile/ &OptParmFiles;</term>
<listitem><para>
Verify the signature of the file. The second form
is used for detached signatures, where <parameter/sigfile/ is the detached
signature (either ASCII armored or binary) and &OptParmFiles are the signed
data; if this is not given the name of the file holding the signed data is
constructed by cutting off the extension (".asc", ".sig" or ".sign") from
<parameter/sigfile/.
</para></listitem></varlistentry>

    </variablelist>
</refsect1>


<refsect1>
    <title>ENVIRONMENT</title>

    <variablelist>
<varlistentry>
<term>HOME</term>
<listitem><para>Used to locate the default home directory.</para></listitem>
</varlistentry>
<varlistentry>
<term>GNUPGHOME</term>
<listitem><para>If set directory used instead of "~/.gnupg".</para></listitem>
</varlistentry>

    </variablelist>

</refsect1>

<refsect1>
    <title>FILES</title>
    <variablelist>

<varlistentry>
<term>~/.gnupg/trustedkeys.gpg</term>
<listitem><para>The default keyring with the allowed keys</para></listitem>
</varlistentry>

    </variablelist>
</refsect1>

<!-- SEE ALSO  not yet needed-->

</refentry>