535 lines
14 KiB
Groff
535 lines
14 KiB
Groff
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.\"
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.\" ++Copyright++ 1985, 1989
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.\" -
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.\" Copyright (c) 1985, 1989
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\" -
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.\" Portions Copyright (c) 1993 by Digital Equipment Corporation.
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies, and that
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.\" the name of Digital Equipment Corporation not be used in advertising or
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.\" publicity pertaining to distribution of the document or software without
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.\" specific, written prior permission.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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.\" WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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.\" CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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.\" DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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.\" PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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.\" ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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.\" SOFTWARE.
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.\" -
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.\" --Copyright--
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.\"
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.\" @(#)nslookup.8 5.3 (Berkeley) 6/24/90
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.\"
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.Dd June 24, 1990
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.Dt NSLOOKUP @SYS_OPS_EXT_U@
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.Os BSD 4
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.Sh NAME
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.Nm nslookup
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.Nd query Internet name servers interactively
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.Sh SYNOPSIS
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.Nm nslookup
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.Op Fl option Ar ...
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.Op Ar host-to-find | Fl Op Ar server
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.Sh DESCRIPTION
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.Ic Nslookup
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is a program to query Internet domain name servers.
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.Ic Nslookup
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has two modes: interactive and non-interactive.
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Interactive mode allows the user to query name servers for
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information about various hosts and domains or to print a list of hosts
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in a domain.
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Non-interactive mode is used to print just the name and requested information
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for a host or domain.
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.Sh ARGUMENTS
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Interactive mode is entered in the following cases:
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.Bl -tag -width "a) "
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.It a)
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when no arguments are given (the default name server will be used),
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.It b)
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when the first argument is a hyphen (-) and the second argument
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is the host name or Internet address of a name server.
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.El
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.Pp
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Non-interactive mode is used when the name or Internet address
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of the host to be looked up
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is given as the first argument. The optional second argument specifies
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the host name or address of a name server.
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.Pp
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The options listed under the
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.Dq Li set
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command below can be specified in
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the
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.Pa .nslookuprc
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file in the user's home directory if they are listed
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one per line. Options can also be specified
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on the command line if they precede the arguments and are prefixed with
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a hyphen. For example, to change the default query type to host information,
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and the initial timeout to 10 seconds, type:
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.Bd -literal -offset indent
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nslookup -query=hinfo -timeout=10
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.Ed
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.Sh INTERACTIVE COMMANDS
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Commands may be interrupted at any time by typing a control-C.
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To exit, type a control-D
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.Pq Dv EOF
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or type
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.Li exit .
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The command line length must be less than 256 characters.
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To treat a built-in command as a host name,
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precede it with an escape character
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.Pq .&\\ .
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.Sy N.B.: An unrecognized command will be interpreted as a host name.
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.Bl -tag -width "lserver"
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.It Ar host Op Ar server
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Look up information for
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.Ar host
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using the current default server or using
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.Ar server ,
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if specified.
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If
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.Ar host
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is an Internet address and the query type is
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.Dv A
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or
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.Dv PTR ,
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the name of the host is returned.
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If
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.Ar host
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is a name and does not have a trailing period, the default
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domain name is appended to the name. (This behavior depends on the state of the
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.Ic set
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options
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.Ic domain , srchlist , defname ,
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and
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.Ic search . )
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.Pp
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To look up a host not in the current domain, append a period to
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the name.
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.It Ic server Ar domain
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.It Ic lserver Ar domain
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Change the default server to
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.Ar domain ;
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.Ic lserver
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uses the initial server to look up information about
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.Ar domain ,
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while
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.Ic server
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uses the current default server.
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If an authoritative answer can't be found, the names of servers
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that might have the answer are returned.
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.It Ic root
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Changes the default server to the server for the root of the domain name space.
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Currently, the host
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.Li ns.internic.net
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is used.
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(This command is a synonym for
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.Dq Ic lserver ns.internic.net . )
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The name of the root server can be changed with the
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.Dq Ic set root
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command.
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.It Xo Ic finger Op Ar name
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.Op Ic > Ar filename
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.Xc
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.It Xo Ic finger Op Ar name
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.Op Ic >> Ar filename
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.Xc
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Connects with the finger server on the current host.
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The current host is defined when a previous lookup for a host
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was successful and returned address information (see the
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.Dq Ic set querytype=A
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command).
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The
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.Ar name
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is optional.
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.Ic >
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and
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.Ic >>
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can be used to redirect output in the usual manner.
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.It Xo Ic ls Op Ar option
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.Ar domain Op Ic > Ar filename
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.Xc
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.It Xo Ic ls Op Ar option
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.Ar domain Op Ic >> Ar filename
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.Xc
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List the information available for
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.Ar domain ,
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optionally creating or appending to
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.Ar filename .
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The default output contains host names and their Internet addresses.
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.Ar Option
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can be one of the following:
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.Bl -tag -width "-a "
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.It Fl t Ar querytype
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lists all records of the specified type (see
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.Ar querytype
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below).
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.It Fl a
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lists aliases of hosts in the domain;
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synonym for
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.Dq Fl t Dv CNAME .
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.It Fl d
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lists all records for the domain;
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synonym for
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.Dq Fl t Dv ANY .
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.It Fl h
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lists CPU and operating system information for the domain;
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synonym for
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.Dq Fl t Dv HINFO .
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.It Fl s
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lists well-known services of hosts in the domain;
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synonym for
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.Dq Fl t Dv WKS .
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.El
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.Pp
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When output is directed to a file, hash marks are printed for every
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50 records received from the server.
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.It Ic view Ar filename
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Sorts and lists the output of previous
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.Ic ls
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command(s) with
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.Xr more @CMD_EXT@ .
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.It Ic help
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.It Ic ?
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Prints a brief summary of commands.
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.It Ic exit
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Exits the program.
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.It Xo Ic set Ar keyword
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.Ns Op = Ns Ar value
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.Xc
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This command is used to change state information that affects the lookups.
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Valid keywords are:
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.Bl -tag -width "class=v"
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.It Ic all
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Prints the current values of the frequently-used options to
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.Ic set .
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Information about the current default server and host is also printed.
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.It Ic class= Ns Ar value
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Change the query class to one of:
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.Bl -tag -width "HESIOD "
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.It Dv IN
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the Internet class
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.It Dv CHAOS
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the Chaos class
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.It Dv HESIOD
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the MIT Athena Hesiod class
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.It Dv ANY
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wildcard (any of the above)
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.El
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.Pp
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The class specifies the protocol group of the information.
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.Pp
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(Default =
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.Dv IN ;
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abbreviation =
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.Ic cl )
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.It Xo Op Ic no
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.Ns Ic debug
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.Xc
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Turn debugging mode on. A lot more information is printed about the
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packet sent to the server and the resulting answer.
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.Pp
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(Default =
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.Ic nodebug ;
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abbreviation =
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.Xo Op Ic no
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.Ns Ic deb )
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.Xc
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.It Xo Op Ic no
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.Ns Ic d2
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.Xc
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Turn exhaustive debugging mode on.
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Essentially all fields of every packet are printed.
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.Pp
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(Default =
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.Ic nod2 )
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.It Ic domain= Ns Ar name
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Change the default domain name to
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.Ar name .
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The default domain name is appended to a lookup request depending on the
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state of the
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.Ic defname
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and
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.Ic search
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options.
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The domain search list contains the parents of the default domain if it has
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at least two components in its name.
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For example, if the default domain
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is CC.Berkeley.EDU, the search list is CC.Berkeley.EDU and Berkeley.EDU.
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Use the
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.Dq Ic set srchlist
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command to specify a different list.
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Use the
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.Dq Ic set all
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command to display the list.
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.Pp
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(Default = value from
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.Xr hostname @CMD_EXT@ ,
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.Pa /etc/resolv.conf ,
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or
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.Ev LOCALDOMAIN;
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abbreviation =
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.Ic do )
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.It Ic srchlist= Ns Ar name1/name2/...
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Change the default domain name to
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.Ar name1
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and the domain search list
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to
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.Ar name1 , name2 ,
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etc. A maximum of 6 names separated by slashes (/)
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can be specified.
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For example,
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.Bd -literal -offset indent
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set srchlist=lcs.MIT.EDU/ai.MIT.EDU/MIT.EDU
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.Ed
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.Pp
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sets the domain to lcs.MIT.EDU and the search list to the three names.
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This command overrides the
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default domain name and search list of the
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.Dq Ic set domain
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command.
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Use the
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.Dq Ic set all
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command to display the list.
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.Pp
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(Default = value based on
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.Xr hostname @CMD_EXT@ ,
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.Pa /etc/resolv.conf ,
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or
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.Ev LOCALDOMAIN;
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abbreviation =
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.Ic srchl )
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.It Xo Op Ic no
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.Ns Ic defname
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.Xc
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If set, append the default domain name to a single-component lookup request
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(i.e., one that does not contain a period).
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.Pp
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(Default =
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.Ic defname ;
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abbreviation =
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.Xo Op Ic no
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.Ns Ic defname )
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.Xc
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.It Xo Op Ic no
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.Ns Ic search
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.Xc
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If the lookup request contains at least one period but
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.Em doesn't
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end with a trailing period, append the domain names in the domain search list
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to the request until an answer is received.
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.Pp
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(Default =
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.Ic search ;
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abbreviation =
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.Xo Op Ic no
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.Ns Ic sea )
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.Xc
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.It Ic port= Ns Ar value
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Change the default TCP/UDP name server port to
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.Ar value .
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.Pp
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(Default = 53;
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abbreviation =
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.Ic \&po )
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.It Ic querytype= Ns Ar value
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.It Ic type= Ns Ar value
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Change the type of information query to one of:
|
||
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.Bl -tag -width "HINFO "
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.It Dv A
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the host's Internet address.
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.It Dv CNAME
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the canonical name for an alias.
|
||
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.It Dv HINFO
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the host CPU and operating system type.
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.It Dv MINFO
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the mailbox or mail list information.
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.It Dv MX
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the mail exchanger.
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||
|
|
.It Dv NS
|
||
|
|
the name server for the named zone.
|
||
|
|
.It Dv PTR
|
||
|
|
the host name if the query is an Internet address;
|
||
|
|
otherwise, the pointer to other information.
|
||
|
|
.It Dv SOA
|
||
|
|
the domain's
|
||
|
|
.Dq start-of-authority
|
||
|
|
information.
|
||
|
|
.It Dv TXT
|
||
|
|
the text information.
|
||
|
|
.It Dv UINFO
|
||
|
|
the user information.
|
||
|
|
.It Dv WKS
|
||
|
|
the supported well-known services.
|
||
|
|
.El
|
||
|
|
.Pp
|
||
|
|
Other types
|
||
|
|
.Pq Dv ANY, AXFR, MB, MD, MF, NULL
|
||
|
|
are described in the RFC-1035 document.
|
||
|
|
.Pp
|
||
|
|
(Default =
|
||
|
|
.Dv A ;
|
||
|
|
abbreviations =
|
||
|
|
.Ic q , ty )
|
||
|
|
.It Xo Op Ic no
|
||
|
|
.Ns Ic recurse
|
||
|
|
.Xc
|
||
|
|
Tell the name server to query other servers if it does not have the
|
||
|
|
information.
|
||
|
|
.Pp
|
||
|
|
(Default =
|
||
|
|
.Ic recurse ;
|
||
|
|
abbreviation =
|
||
|
|
.Xo Op Ic no
|
||
|
|
.Ns Ic rec )
|
||
|
|
.Xc
|
||
|
|
.It Ic retry= Ns Ar number
|
||
|
|
Set the number of retries to
|
||
|
|
.Ar number .
|
||
|
|
When a reply to a request is not received within a certain
|
||
|
|
amount of time (changed with
|
||
|
|
.Dq Ic set timeout ) ,
|
||
|
|
the timeout period is doubled and the request is resent.
|
||
|
|
The retry value controls how many times a request is resent before giving up.
|
||
|
|
.Pp
|
||
|
|
(Default = 4, abbreviation =
|
||
|
|
.Ic ret )
|
||
|
|
.It Ic root= Ns Ar host
|
||
|
|
Change the name of the root server to
|
||
|
|
.Ar host .
|
||
|
|
This affects the
|
||
|
|
.Dq Ic root
|
||
|
|
command.
|
||
|
|
.Pp
|
||
|
|
(Default =
|
||
|
|
.Ic ns.internic.net. ;
|
||
|
|
abbreviation =
|
||
|
|
.Ic ro )
|
||
|
|
.It Ic timeout= Ns Ar number
|
||
|
|
Change the initial timeout interval for waiting for a reply to
|
||
|
|
.Ar number
|
||
|
|
seconds. Each retry doubles the timeout period.
|
||
|
|
.Pp
|
||
|
|
(Default = 5 seconds; abbreviation =
|
||
|
|
.Ic ti )
|
||
|
|
.It Xo Op Ic no
|
||
|
|
.Ns Ic vc
|
||
|
|
.Xc
|
||
|
|
Always use a virtual circuit when sending requests to the server.
|
||
|
|
.Pp
|
||
|
|
(Default =
|
||
|
|
.Ic novc ;
|
||
|
|
abbreviation =
|
||
|
|
.Xo Op Ic no
|
||
|
|
.Ns Ic v )
|
||
|
|
.Xc
|
||
|
|
.It Xo Op Ic no
|
||
|
|
.Ns Ic ignoretc
|
||
|
|
.Xc
|
||
|
|
Ignore packet truncation errors.
|
||
|
|
.Pp
|
||
|
|
(Default =
|
||
|
|
.Ic noignoretc ;
|
||
|
|
abbreviation =
|
||
|
|
.Xo Op Ic no
|
||
|
|
.Ns Ic ig )
|
||
|
|
.Xc
|
||
|
|
.El
|
||
|
|
.El
|
||
|
|
.Sh DIAGNOSTICS
|
||
|
|
If the lookup request was not successful, an error message is printed.
|
||
|
|
Possible errors are:
|
||
|
|
.Bl -tag -width "Timed"
|
||
|
|
.It Li Timed out
|
||
|
|
The server did not respond to a request after a certain amount of
|
||
|
|
time (changed with
|
||
|
|
.Dq Ic set timeout= Ns Ar value )
|
||
|
|
and a certain number of retries (changed with
|
||
|
|
.Dq Ic set retry= Ns Ar value ) .
|
||
|
|
.It Li \&No response from server
|
||
|
|
No name server is running on the server machine.
|
||
|
|
.It Li \&No records
|
||
|
|
The server does not have resource records of the current query type for the
|
||
|
|
host, although the host name is valid.
|
||
|
|
The query type is specified with the
|
||
|
|
.Dq Ic set querytype
|
||
|
|
command.
|
||
|
|
.It Li Non-existent domain
|
||
|
|
The host or domain name does not exist.
|
||
|
|
.It Li Connection refused
|
||
|
|
.It Li Network is unreachable
|
||
|
|
The connection to the name or finger server could not be made
|
||
|
|
at the current time.
|
||
|
|
This error commonly occurs with
|
||
|
|
.Ic ls
|
||
|
|
and
|
||
|
|
.Ic finger
|
||
|
|
requests.
|
||
|
|
.It Li Server failure
|
||
|
|
The name server found an internal inconsistency in its database
|
||
|
|
and could not return a valid answer.
|
||
|
|
.It Li Refused
|
||
|
|
The name server refused to service the request.
|
||
|
|
.It Li Format error
|
||
|
|
The name server found that the request packet was not in the proper format.
|
||
|
|
It may indicate an error in
|
||
|
|
.Nm nslookup .
|
||
|
|
.El
|
||
|
|
.Sh FILES
|
||
|
|
.Bl -tag -width "/usr/share/misc/nslookup.helpXXX" -compact
|
||
|
|
.It Pa /etc/resolv.conf
|
||
|
|
initial domain name and name server addresses
|
||
|
|
.It Pa $HOME/.nslookuprc
|
||
|
|
user's initial options
|
||
|
|
.It Pa /usr/share/misc/nslookup.help
|
||
|
|
summary of commands
|
||
|
|
.Sh ENVIRONMENT
|
||
|
|
.Bl -tag -width "HOSTALIASESXXXX" -compact
|
||
|
|
.It Ev HOSTALIASES
|
||
|
|
file containing host aliases
|
||
|
|
.It Ev LOCALDOMAIN
|
||
|
|
overrides default domain
|
||
|
|
.Sh SEE ALSO
|
||
|
|
.Xr @INDOT@named @SYS_OPS_EXT@ ,
|
||
|
|
.Xr resolver @LIB_NETWORK_EXT@ ,
|
||
|
|
.Xr resolver @FORMAT_EXT@ ;
|
||
|
|
RFC-1034,
|
||
|
|
.Dq Domain Names - Concepts and Facilities ;
|
||
|
|
RFC-1035,
|
||
|
|
.Dq Domain Names - Implementation and Specification .
|
||
|
|
.Sh AUTHOR
|
||
|
|
Andrew Cherenson
|