Title: dns commands
Subject: short examples of using dns commands.
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FILES
     /etc/named.conf                             default name server configu­
                                                 ration file
     /var/run/named.pid (_PATH_PIDFILE)          the process id
     /var/tmp/named_dump.db (_PATH_DUMPFILE)     dump of the name server
                                                 database
     /var/tmp/named.run (file: _PATH_DEBUG)      debug output
     /var/tmp/named.stats (file: _PATH_STATS)    nameserver statistics data
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  hostname
    mother.stilen.com
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NOTE: This is to see who holds the mx records for the domain.  
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nslookup -querytype=mx stilen.com
  Server:  dns1-sac.scrm01.pacbell.net
  Address:  206.13.31.12

  Authoritative answers can be found from:
  stilen.com
	origin = NS11.WORLDNIC.COM
	mail addr = namehost.WORLDNIC.COM
	serial = 2000042800
	refresh = 3600 (1H)
	retry   = 3600 (1H)
	expire  = 432000 (5D)
	minimum ttl = 86400 (1D)
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nslookup -querytype=mx linux.org
  Server:  dns1-sac.scrm01.pacbell.net
  Address:  206.13.31.12

  Non-authoritative answer:
   linux.org	preference = 10, mail exchanger = mail.linux.org
   linux.org	preference = 20, mail exchanger = router.invlogic.com
   linux.org	preference = 30, mail exchanger = border-ai.invlogic.com

  Authoritative answers can be found from:
   linux.org	nameserver = NS.invlogic.com
   linux.org	nameserver = NS0.AITCOM.NET
   mail.linux.org	internet address = 198.182.196.60
   router.invlogic.com	internet address = 198.182.196.1
   border-ai.invlogic.com	internet address = 205.134.175.254
   NS.invlogic.com	internet address = 205.134.175.254
   NS0.AITCOM.NET	internet address = 208.234.1.34
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==============================================================
	Shell script 
==============================================================
PLAN FOR PROJECT
nslookup
>set type=ns
>domain_name1.com domain_name2.comdomain_name3.com

Grab lines that contain "nameserver", weed out duplicates
> set type=SOA  

turn off recurse so ns doesn't query a non-SOA
> set norecurse 

see responce when srver does not have the SOA record
(this output went to stderr)
> mit.edu

Test a positive responce
> server strawb.mit.edu
> mit.edu

If the server had looked up the SOA and chached it, the name server would have
returned the SOA record, and said "non-authoritative"
When the server has the SOA record, and it is Authoritative, we grab the line
"serial"

Now we need to see what it looks like when the name server is down
(this output went to stderr)
> server galt.cs.purdue.edu
> set type=soa
> mit.edu
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CODE:
in progress.