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+<!--
+ - Copyright (C) 2004-2008 Internet Systems Consortium, Inc. ("ISC")
+ - Copyright (C) 2000-2003 Internet Software Consortium.
+ -
+ - Permission to use, copy, modify, and distribute this software for any
+ - purpose with or without fee is hereby granted, provided that the above
+ - copyright notice and this permission notice appear in all copies.
+ -
+ - THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+ - REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ - AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+ - INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ - LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ - OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ - PERFORMANCE OF THIS SOFTWARE.
+-->
+<!-- $Id: dig.html,v 1.45 2008/10/14 01:11:35 tbox Exp $ -->
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+<title>dig</title>
+<meta name="generator" content="DocBook XSL Stylesheets V1.71.1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en">
+<a name="man.dig"></a><div class="titlepage"></div>
+<div class="refnamediv">
+<h2>Name</h2>
+<p>dig &#8212; DNS lookup utility</p>
+</div>
+<div class="refsynopsisdiv">
+<h2>Synopsis</h2>
+<div class="cmdsynopsis"><p><code class="command">dig</code> [@server] [<code class="option">-b <em class="replaceable"><code>address</code></em></code>] [<code class="option">-c <em class="replaceable"><code>class</code></em></code>] [<code class="option">-f <em class="replaceable"><code>filename</code></em></code>] [<code class="option">-k <em class="replaceable"><code>filename</code></em></code>] [<code class="option">-m</code>] [<code class="option">-p <em class="replaceable"><code>port#</code></em></code>] [<code class="option">-q <em class="replaceable"><code>name</code></em></code>] [<code class="option">-t <em class="replaceable"><code>type</code></em></code>] [<code class="option">-x <em class="replaceable"><code>addr</code></em></code>] [<code class="option">-y <em class="replaceable"><code>[<span class="optional">hmac:</span>]name:key</code></em></code>] [<code class="option">-4</code>] [<code class="option">-6</code>] [name] [type] [class] [queryopt...]</p></div>
+<div class="cmdsynopsis"><p><code class="command">dig</code> [<code class="option">-h</code>]</p></div>
+<div class="cmdsynopsis"><p><code class="command">dig</code> [global-queryopt...] [query...]</p></div>
+</div>
+<div class="refsect1" lang="en">
+<a name="id2543515"></a><h2>DESCRIPTION</h2>
+<p><span><strong class="command">dig</strong></span>
+ (domain information groper) is a flexible tool
+ for interrogating DNS name servers. It performs DNS lookups and
+ displays the answers that are returned from the name server(s) that
+ were queried. Most DNS administrators use <span><strong class="command">dig</strong></span> to
+ troubleshoot DNS problems because of its flexibility, ease of use and
+ clarity of output. Other lookup tools tend to have less functionality
+ than <span><strong class="command">dig</strong></span>.
+ </p>
+<p>
+ Although <span><strong class="command">dig</strong></span> is normally used with
+ command-line
+ arguments, it also has a batch mode of operation for reading lookup
+ requests from a file. A brief summary of its command-line arguments
+ and options is printed when the <code class="option">-h</code> option is given.
+ Unlike earlier versions, the BIND 9 implementation of
+ <span><strong class="command">dig</strong></span> allows multiple lookups to be issued
+ from the
+ command line.
+ </p>
+<p>
+ Unless it is told to query a specific name server,
+ <span><strong class="command">dig</strong></span> will try each of the servers listed
+ in
+ <code class="filename">/etc/resolv.conf</code>.
+ </p>
+<p>
+ When no command line arguments or options are given,
+ <span><strong class="command">dig</strong></span> will perform an NS query for "." (the root).
+ </p>
+<p>
+ It is possible to set per-user defaults for <span><strong class="command">dig</strong></span> via
+ <code class="filename">${HOME}/.digrc</code>. This file is read and
+ any options in it
+ are applied before the command line arguments.
+ </p>
+<p>
+ The IN and CH class names overlap with the IN and CH top level
+ domains names. Either use the <code class="option">-t</code> and
+ <code class="option">-c</code> options to specify the type and class,
+ use the <code class="option">-q</code> the specify the domain name, or
+ use "IN." and "CH." when looking up these top level domains.
+ </p>
+</div>
+<div class="refsect1" lang="en">
+<a name="id2543589"></a><h2>SIMPLE USAGE</h2>
+<p>
+ A typical invocation of <span><strong class="command">dig</strong></span> looks like:
+ </p>
+<pre class="programlisting"> dig @server name type </pre>
+<p>
+ where:
+
+ </p>
+<div class="variablelist"><dl>
+<dt><span class="term"><code class="constant">server</code></span></dt>
+<dd><p>
+ is the name or IP address of the name server to query. This can
+ be an IPv4
+ address in dotted-decimal notation or an IPv6
+ address in colon-delimited notation. When the supplied
+ <em class="parameter"><code>server</code></em> argument is a
+ hostname,
+ <span><strong class="command">dig</strong></span> resolves that name before
+ querying that name
+ server. If no <em class="parameter"><code>server</code></em>
+ argument is provided,
+ <span><strong class="command">dig</strong></span> consults <code class="filename">/etc/resolv.conf</code>
+ and queries the name servers listed there. The reply from the
+ name
+ server that responds is displayed.
+ </p></dd>
+<dt><span class="term"><code class="constant">name</code></span></dt>
+<dd><p>
+ is the name of the resource record that is to be looked up.
+ </p></dd>
+<dt><span class="term"><code class="constant">type</code></span></dt>
+<dd><p>
+ indicates what type of query is required &#8212;
+ ANY, A, MX, SIG, etc.
+ <em class="parameter"><code>type</code></em> can be any valid query
+ type. If no
+ <em class="parameter"><code>type</code></em> argument is supplied,
+ <span><strong class="command">dig</strong></span> will perform a lookup for an
+ A record.
+ </p></dd>
+</dl></div>
+<p>
+ </p>
+</div>
+<div class="refsect1" lang="en">
+<a name="id2543680"></a><h2>OPTIONS</h2>
+<p>
+ The <code class="option">-b</code> option sets the source IP address of the query
+ to <em class="parameter"><code>address</code></em>. This must be a valid
+ address on
+ one of the host's network interfaces or "0.0.0.0" or "::". An optional
+ port
+ may be specified by appending "#&lt;port&gt;"
+ </p>
+<p>
+ The default query class (IN for internet) is overridden by the
+ <code class="option">-c</code> option. <em class="parameter"><code>class</code></em> is
+ any valid
+ class, such as HS for Hesiod records or CH for Chaosnet records.
+ </p>
+<p>
+ The <code class="option">-f</code> option makes <span><strong class="command">dig </strong></span>
+ operate
+ in batch mode by reading a list of lookup requests to process from the
+ file <em class="parameter"><code>filename</code></em>. The file contains a
+ number of
+ queries, one per line. Each entry in the file should be organized in
+ the same way they would be presented as queries to
+ <span><strong class="command">dig</strong></span> using the command-line interface.
+ </p>
+<p>
+ The <code class="option">-m</code> option enables memory usage debugging.
+
+ </p>
+<p>
+ If a non-standard port number is to be queried, the
+ <code class="option">-p</code> option is used. <em class="parameter"><code>port#</code></em> is
+ the port number that <span><strong class="command">dig</strong></span> will send its
+ queries
+ instead of the standard DNS port number 53. This option would be used
+ to test a name server that has been configured to listen for queries
+ on a non-standard port number.
+ </p>
+<p>
+ The <code class="option">-4</code> option forces <span><strong class="command">dig</strong></span>
+ to only
+ use IPv4 query transport. The <code class="option">-6</code> option forces
+ <span><strong class="command">dig</strong></span> to only use IPv6 query transport.
+ </p>
+<p>
+ The <code class="option">-t</code> option sets the query type to
+ <em class="parameter"><code>type</code></em>. It can be any valid query type
+ which is
+ supported in BIND 9. The default query type is "A", unless the
+ <code class="option">-x</code> option is supplied to indicate a reverse lookup.
+ A zone transfer can be requested by specifying a type of AXFR. When
+ an incremental zone transfer (IXFR) is required,
+ <em class="parameter"><code>type</code></em> is set to <code class="literal">ixfr=N</code>.
+ The incremental zone transfer will contain the changes made to the zone
+ since the serial number in the zone's SOA record was
+ <em class="parameter"><code>N</code></em>.
+ </p>
+<p>
+ The <code class="option">-q</code> option sets the query name to
+ <em class="parameter"><code>name</code></em>. This useful do distinguish the
+ <em class="parameter"><code>name</code></em> from other arguments.
+ </p>
+<p>
+ Reverse lookups &#8212; mapping addresses to names &#8212; are simplified by the
+ <code class="option">-x</code> option. <em class="parameter"><code>addr</code></em> is
+ an IPv4
+ address in dotted-decimal notation, or a colon-delimited IPv6 address.
+ When this option is used, there is no need to provide the
+ <em class="parameter"><code>name</code></em>, <em class="parameter"><code>class</code></em> and
+ <em class="parameter"><code>type</code></em> arguments. <span><strong class="command">dig</strong></span>
+ automatically performs a lookup for a name like
+ <code class="literal">11.12.13.10.in-addr.arpa</code> and sets the
+ query type and
+ class to PTR and IN respectively. By default, IPv6 addresses are
+ looked up using nibble format under the IP6.ARPA domain.
+ To use the older RFC1886 method using the IP6.INT domain
+ specify the <code class="option">-i</code> option. Bit string labels (RFC2874)
+ are now experimental and are not attempted.
+ </p>
+<p>
+ To sign the DNS queries sent by <span><strong class="command">dig</strong></span> and
+ their
+ responses using transaction signatures (TSIG), specify a TSIG key file
+ using the <code class="option">-k</code> option. You can also specify the TSIG
+ key itself on the command line using the <code class="option">-y</code> option;
+ <em class="parameter"><code>hmac</code></em> is the type of the TSIG, default HMAC-MD5,
+ <em class="parameter"><code>name</code></em> is the name of the TSIG key and
+ <em class="parameter"><code>key</code></em> is the actual key. The key is a
+ base-64
+ encoded string, typically generated by
+ <span class="citerefentry"><span class="refentrytitle">dnssec-keygen</span>(8)</span>.
+
+ Caution should be taken when using the <code class="option">-y</code> option on
+ multi-user systems as the key can be visible in the output from
+ <span class="citerefentry"><span class="refentrytitle">ps</span>(1)</span>
+ or in the shell's history file. When
+ using TSIG authentication with <span><strong class="command">dig</strong></span>, the name
+ server that is queried needs to know the key and algorithm that is
+ being used. In BIND, this is done by providing appropriate
+ <span><strong class="command">key</strong></span> and <span><strong class="command">server</strong></span> statements in
+ <code class="filename">named.conf</code>.
+ </p>
+</div>
+<div class="refsect1" lang="en">
+<a name="id2544028"></a><h2>QUERY OPTIONS</h2>
+<p><span><strong class="command">dig</strong></span>
+ provides a number of query options which affect
+ the way in which lookups are made and the results displayed. Some of
+ these set or reset flag bits in the query header, some determine which
+ sections of the answer get printed, and others determine the timeout
+ and retry strategies.
+ </p>
+<p>
+ Each query option is identified by a keyword preceded by a plus sign
+ (<code class="literal">+</code>). Some keywords set or reset an
+ option. These may be preceded
+ by the string <code class="literal">no</code> to negate the meaning of
+ that keyword. Other
+ keywords assign values to options like the timeout interval. They
+ have the form <code class="option">+keyword=value</code>.
+ The query options are:
+
+ </p>
+<div class="variablelist"><dl>
+<dt><span class="term"><code class="option">+[no]tcp</code></span></dt>
+<dd><p>
+ Use [do not use] TCP when querying name servers. The default
+ behavior is to use UDP unless an AXFR or IXFR query is
+ requested, in
+ which case a TCP connection is used.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]vc</code></span></dt>
+<dd><p>
+ Use [do not use] TCP when querying name servers. This alternate
+ syntax to <em class="parameter"><code>+[no]tcp</code></em> is
+ provided for backwards
+ compatibility. The "vc" stands for "virtual circuit".
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]ignore</code></span></dt>
+<dd><p>
+ Ignore truncation in UDP responses instead of retrying with TCP.
+ By
+ default, TCP retries are performed.
+ </p></dd>
+<dt><span class="term"><code class="option">+domain=somename</code></span></dt>
+<dd><p>
+ Set the search list to contain the single domain
+ <em class="parameter"><code>somename</code></em>, as if specified in
+ a
+ <span><strong class="command">domain</strong></span> directive in
+ <code class="filename">/etc/resolv.conf</code>, and enable
+ search list
+ processing as if the <em class="parameter"><code>+search</code></em>
+ option were given.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]search</code></span></dt>
+<dd><p>
+ Use [do not use] the search list defined by the searchlist or
+ domain
+ directive in <code class="filename">resolv.conf</code> (if
+ any).
+ The search list is not used by default.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]showsearch</code></span></dt>
+<dd><p>
+ Perform [do not perform] a search showing intermediate
+ results.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]defname</code></span></dt>
+<dd><p>
+ Deprecated, treated as a synonym for <em class="parameter"><code>+[no]search</code></em>
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]aaonly</code></span></dt>
+<dd><p>
+ Sets the "aa" flag in the query.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]aaflag</code></span></dt>
+<dd><p>
+ A synonym for <em class="parameter"><code>+[no]aaonly</code></em>.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]adflag</code></span></dt>
+<dd><p>
+ Set [do not set] the AD (authentic data) bit in the query. The
+ AD bit
+ currently has a standard meaning only in responses, not in
+ queries,
+ but the ability to set the bit in the query is provided for
+ completeness.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]cdflag</code></span></dt>
+<dd><p>
+ Set [do not set] the CD (checking disabled) bit in the query.
+ This
+ requests the server to not perform DNSSEC validation of
+ responses.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]cl</code></span></dt>
+<dd><p>
+ Display [do not display] the CLASS when printing the record.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]ttlid</code></span></dt>
+<dd><p>
+ Display [do not display] the TTL when printing the record.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]recurse</code></span></dt>
+<dd><p>
+ Toggle the setting of the RD (recursion desired) bit in the
+ query.
+ This bit is set by default, which means <span><strong class="command">dig</strong></span>
+ normally sends recursive queries. Recursion is automatically
+ disabled
+ when the <em class="parameter"><code>+nssearch</code></em> or
+ <em class="parameter"><code>+trace</code></em> query options are
+ used.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]nssearch</code></span></dt>
+<dd><p>
+ When this option is set, <span><strong class="command">dig</strong></span>
+ attempts to find the
+ authoritative name servers for the zone containing the name
+ being
+ looked up and display the SOA record that each name server has
+ for the
+ zone.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]trace</code></span></dt>
+<dd><p>
+ Toggle tracing of the delegation path from the root name servers
+ for
+ the name being looked up. Tracing is disabled by default. When
+ tracing is enabled, <span><strong class="command">dig</strong></span> makes
+ iterative queries to
+ resolve the name being looked up. It will follow referrals from
+ the
+ root servers, showing the answer from each server that was used
+ to
+ resolve the lookup.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]cmd</code></span></dt>
+<dd><p>
+ Toggles the printing of the initial comment in the output
+ identifying
+ the version of <span><strong class="command">dig</strong></span> and the query
+ options that have
+ been applied. This comment is printed by default.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]short</code></span></dt>
+<dd><p>
+ Provide a terse answer. The default is to print the answer in a
+ verbose form.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]identify</code></span></dt>
+<dd><p>
+ Show [or do not show] the IP address and port number that
+ supplied the
+ answer when the <em class="parameter"><code>+short</code></em> option
+ is enabled. If
+ short form answers are requested, the default is not to show the
+ source address and port number of the server that provided the
+ answer.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]comments</code></span></dt>
+<dd><p>
+ Toggle the display of comment lines in the output. The default
+ is to
+ print comments.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]stats</code></span></dt>
+<dd><p>
+ This query option toggles the printing of statistics: when the
+ query
+ was made, the size of the reply and so on. The default
+ behavior is
+ to print the query statistics.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]qr</code></span></dt>
+<dd><p>
+ Print [do not print] the query as it is sent.
+ By default, the query is not printed.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]question</code></span></dt>
+<dd><p>
+ Print [do not print] the question section of a query when an
+ answer is
+ returned. The default is to print the question section as a
+ comment.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]answer</code></span></dt>
+<dd><p>
+ Display [do not display] the answer section of a reply. The
+ default
+ is to display it.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]authority</code></span></dt>
+<dd><p>
+ Display [do not display] the authority section of a reply. The
+ default is to display it.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]additional</code></span></dt>
+<dd><p>
+ Display [do not display] the additional section of a reply.
+ The default is to display it.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]all</code></span></dt>
+<dd><p>
+ Set or clear all display flags.
+ </p></dd>
+<dt><span class="term"><code class="option">+time=T</code></span></dt>
+<dd><p>
+
+ Sets the timeout for a query to
+ <em class="parameter"><code>T</code></em> seconds. The default
+ timeout is 5 seconds.
+ An attempt to set <em class="parameter"><code>T</code></em> to less
+ than 1 will result
+ in a query timeout of 1 second being applied.
+ </p></dd>
+<dt><span class="term"><code class="option">+tries=T</code></span></dt>
+<dd><p>
+ Sets the number of times to try UDP queries to server to
+ <em class="parameter"><code>T</code></em> instead of the default, 3.
+ If
+ <em class="parameter"><code>T</code></em> is less than or equal to
+ zero, the number of
+ tries is silently rounded up to 1.
+ </p></dd>
+<dt><span class="term"><code class="option">+retry=T</code></span></dt>
+<dd><p>
+ Sets the number of times to retry UDP queries to server to
+ <em class="parameter"><code>T</code></em> instead of the default, 2.
+ Unlike
+ <em class="parameter"><code>+tries</code></em>, this does not include
+ the initial
+ query.
+ </p></dd>
+<dt><span class="term"><code class="option">+ndots=D</code></span></dt>
+<dd><p>
+ Set the number of dots that have to appear in
+ <em class="parameter"><code>name</code></em> to <em class="parameter"><code>D</code></em> for it to be
+ considered absolute. The default value is that defined using
+ the
+ ndots statement in <code class="filename">/etc/resolv.conf</code>, or 1 if no
+ ndots statement is present. Names with fewer dots are
+ interpreted as
+ relative names and will be searched for in the domains listed in
+ the
+ <code class="option">search</code> or <code class="option">domain</code> directive in
+ <code class="filename">/etc/resolv.conf</code>.
+ </p></dd>
+<dt><span class="term"><code class="option">+bufsize=B</code></span></dt>
+<dd><p>
+ Set the UDP message buffer size advertised using EDNS0 to
+ <em class="parameter"><code>B</code></em> bytes. The maximum and minimum sizes
+ of this buffer are 65535 and 0 respectively. Values outside
+ this range are rounded up or down appropriately.
+ Values other than zero will cause a EDNS query to be sent.
+ </p></dd>
+<dt><span class="term"><code class="option">+edns=#</code></span></dt>
+<dd><p>
+ Specify the EDNS version to query with. Valid values
+ are 0 to 255. Setting the EDNS version will cause a
+ EDNS query to be sent. <code class="option">+noedns</code> clears the
+ remembered EDNS version.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]multiline</code></span></dt>
+<dd><p>
+ Print records like the SOA records in a verbose multi-line
+ format with human-readable comments. The default is to print
+ each record on a single line, to facilitate machine parsing
+ of the <span><strong class="command">dig</strong></span> output.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]fail</code></span></dt>
+<dd><p>
+ Do not try the next server if you receive a SERVFAIL. The
+ default is
+ to not try the next server which is the reverse of normal stub
+ resolver
+ behavior.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]besteffort</code></span></dt>
+<dd><p>
+ Attempt to display the contents of messages which are malformed.
+ The default is to not display malformed answers.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]dnssec</code></span></dt>
+<dd><p>
+ Requests DNSSEC records be sent by setting the DNSSEC OK bit
+ (DO)
+ in the OPT record in the additional section of the query.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]sigchase</code></span></dt>
+<dd><p>
+ Chase DNSSEC signature chains. Requires dig be compiled with
+ -DDIG_SIGCHASE.
+ </p></dd>
+<dt><span class="term"><code class="option">+trusted-key=####</code></span></dt>
+<dd>
+<p>
+ Specifies a file containing trusted keys to be used with
+ <code class="option">+sigchase</code>. Each DNSKEY record must be
+ on its own line.
+ </p>
+<p>
+ If not specified <span><strong class="command">dig</strong></span> will look for
+ <code class="filename">/etc/trusted-key.key</code> then
+ <code class="filename">trusted-key.key</code> in the current directory.
+ </p>
+<p>
+ Requires dig be compiled with -DDIG_SIGCHASE.
+ </p>
+</dd>
+<dt><span class="term"><code class="option">+[no]topdown</code></span></dt>
+<dd><p>
+ When chasing DNSSEC signature chains perform a top-down
+ validation.
+ Requires dig be compiled with -DDIG_SIGCHASE.
+ </p></dd>
+<dt><span class="term"><code class="option">+[no]nsid</code></span></dt>
+<dd><p>
+ Include an EDNS name server ID request when sending a query.
+ </p></dd>
+</dl></div>
+<p>
+
+ </p>
+</div>
+<div class="refsect1" lang="en">
+<a name="id2545163"></a><h2>MULTIPLE QUERIES</h2>
+<p>
+ The BIND 9 implementation of <span><strong class="command">dig </strong></span>
+ supports
+ specifying multiple queries on the command line (in addition to
+ supporting the <code class="option">-f</code> batch file option). Each of those
+ queries can be supplied with its own set of flags, options and query
+ options.
+ </p>
+<p>
+ In this case, each <em class="parameter"><code>query</code></em> argument
+ represent an
+ individual query in the command-line syntax described above. Each
+ consists of any of the standard options and flags, the name to be
+ looked up, an optional query type and class and any query options that
+ should be applied to that query.
+ </p>
+<p>
+ A global set of query options, which should be applied to all queries,
+ can also be supplied. These global query options must precede the
+ first tuple of name, class, type, options, flags, and query options
+ supplied on the command line. Any global query options (except
+ the <code class="option">+[no]cmd</code> option) can be
+ overridden by a query-specific set of query options. For example:
+ </p>
+<pre class="programlisting">
+dig +qr www.isc.org any -x 127.0.0.1 isc.org ns +noqr
+</pre>
+<p>
+ shows how <span><strong class="command">dig</strong></span> could be used from the
+ command line
+ to make three lookups: an ANY query for <code class="literal">www.isc.org</code>, a
+ reverse lookup of 127.0.0.1 and a query for the NS records of
+ <code class="literal">isc.org</code>.
+
+ A global query option of <em class="parameter"><code>+qr</code></em> is
+ applied, so
+ that <span><strong class="command">dig</strong></span> shows the initial query it made
+ for each
+ lookup. The final query has a local query option of
+ <em class="parameter"><code>+noqr</code></em> which means that <span><strong class="command">dig</strong></span>
+ will not print the initial query when it looks up the NS records for
+ <code class="literal">isc.org</code>.
+ </p>
+</div>
+<div class="refsect1" lang="en">
+<a name="id2545225"></a><h2>IDN SUPPORT</h2>
+<p>
+ If <span><strong class="command">dig</strong></span> has been built with IDN (internationalized
+ domain name) support, it can accept and display non-ASCII domain names.
+ <span><strong class="command">dig</strong></span> appropriately converts character encoding of
+ domain name before sending a request to DNS server or displaying a
+ reply from the server.
+ If you'd like to turn off the IDN support for some reason, defines
+ the <code class="envar">IDN_DISABLE</code> environment variable.
+ The IDN support is disabled if the variable is set when
+ <span><strong class="command">dig</strong></span> runs.
+ </p>
+</div>
+<div class="refsect1" lang="en">
+<a name="id2545248"></a><h2>FILES</h2>
+<p><code class="filename">/etc/resolv.conf</code>
+ </p>
+<p><code class="filename">${HOME}/.digrc</code>
+ </p>
+</div>
+<div class="refsect1" lang="en">
+<a name="id2545333"></a><h2>SEE ALSO</h2>
+<p><span class="citerefentry"><span class="refentrytitle">host</span>(1)</span>,
+ <span class="citerefentry"><span class="refentrytitle">named</span>(8)</span>,
+ <span class="citerefentry"><span class="refentrytitle">dnssec-keygen</span>(8)</span>,
+ <em class="citetitle">RFC1035</em>.
+ </p>
+</div>
+<div class="refsect1" lang="en">
+<a name="id2545370"></a><h2>BUGS</h2>
+<p>
+ There are probably too many query options.
+ </p>
+</div>
+</div></body>
+</html>