lpic2

   nslookup [-option] [name | -] [server]

   Interactive mode is entered in the following cases:

    1. when no arguments are given (the default name server will be used)

    2. when the first argument is a hyphen (-) and the second argument is the host name or Internet address of a name server.

   Non-interactive mode is used when the name or Internet address of the host to be looked up is given as the first argument. The optional second argument specifies the host name or address of a name server.

   Options can also be specified on the command line if they precede the arguments and are prefixed with a hyphen. For example, to change the default query type to host information, and the initial timeout to 10 seconds, type:

       nslookup -query=hinfo  -timeout=10

   The -version option causes nslookup to print the version number and immediately exits.

   host [server]
       Look up information for host using the current default server or using server, if specified. If host is an Internet address and the query type is A or PTR, the name of the host is returned. If host is a name and does not have a trailing
       period, the search list is used to qualify the name.

       To look up a host not in the current domain, append a period to the name.

   server domain

   lserver domain
       Change the default server to domain; lserver uses the initial server to look up information about domain, while server uses the current default server. If an authoritative answer can't be found, the names of servers that might have the
       answer are returned.

   root
       not implemented

   finger
       not implemented

   ls
       not implemented

   view
       not implemented

   help
       not implemented

   ?
       not implemented

   exit
       Exits the program.

   set keyword[=value]
       This command is used to change state information that affects the lookups. Valid keywords are:

       all
           Prints the current values of the frequently used options to set. Information about the current default server and host is also printed.

       class=value
           Change the query class to one of:

           IN
               the Internet class

           CH
               the Chaos class

           HS
               the Hesiod class

           ANY
               wildcard

           The class specifies the protocol group of the information.

           (Default = IN; abbreviation = cl)

       [no]debug
           Turn on or off the display of the full response packet and any intermediate response packets when searching.

           (Default = nodebug; abbreviation = [no]deb)

       [no]d2
           Turn debugging mode on or off. This displays more about what nslookup is doing.

           (Default = nod2)

       domain=name
           Sets the search list to name.

       [no]search
           If the lookup request contains at least one period but doesn't end with a trailing period, append the domain names in the domain search list to the request until an answer is received.

           (Default = search)

       port=value
           Change the default TCP/UDP name server port to value.

           (Default = 53; abbreviation = po)

       querytype=value

       type=value
           Change the type of the information query.

           (Default = A; abbreviations = q, ty)

       [no]recurse
           Tell the name server to query other servers if it does not have the information.

           (Default = recurse; abbreviation = [no]rec)

       ndots=number
           Set the number of dots (label separators) in a domain that will disable searching. Absolute names always stop searching.

       retry=number
           Set the number of retries to number.

       timeout=number
           Change the initial timeout interval for waiting for a reply to number seconds.

       [no]vc
           Always use a virtual circuit when sending requests to the server.

           (Default = novc)

       [no]fail
           Try the next nameserver if a nameserver responds with SERVFAIL or a referral (nofail) or terminate query (fail) on such a response.

           (Default = nofail)

   nslookup returns with an exit status of 1 if any query failed, and 0 otherwise.