topic Re: difference nslookup between Linux and HP-UX in Operating System - Linux

difference nslookup between Linux and HP-UX

Billa-User — Wed, 06 Apr 2011 10:32:55 GMT

hello,

i have following issue :
- HP-UX 11.31 dns-server BIND 9.3.2
- Linux SLES 10 dns-server BIND 9.3.4

i want the same output of command "nslookup"
what option's i have to use for Linux with command "nslookup" ?

following command i made:

1. login at dns-server
2. nslookup
3. server localhost
4.

detail out in the attachment,
first part "HP-UX"
second part "Linux"

regards,tom

Re: difference nslookup between Linux and HP-UX

Viktor Balogh — Wed, 06 Apr 2011 10:49:37 GMT

> i want the same output of command "nslookup"

do you want these to be the same to the letter? the output looks semantically equivalent to me:

HP-UX:

Trying DNS
Name: server.example.com
Address: 192.164.170.32

Linux:

Non-authoritative answer:
32.170.164.192.in-addr.arpa name = server.example.com

Re: difference nslookup between Linux and HP-UX

Billa-User — Wed, 06 Apr 2011 11:13:04 GMT

hello,

@the output looks semantically equivalent to me:

your are right, semantically is it the same , but the output is different :

for me , it is easier to parse the output of HP-UX with following shell script below.

HP-UX:

Trying DNS
Name: server.example.com
Address: 192.164.170.32

nslookup_localhost="server localhost"
ip_address="192.164.170.32"

dns_hostentry=`nslookup <<-EOF | grep '^Name:' |tail -1 | awk '{print $NF}'
${nslookup_localhost}
${ip_address}
exit
EOF `

i idea of me is , to make two different shell commands :

ux_version="uname -s"

and nslookup parse should be different for $ux_version

regards,tom

Re: difference nslookup between Linux and HP-UX

Viktor Balogh — Wed, 06 Apr 2011 11:18:40 GMT

> for me , it is easier to parse the output of HP-UX with following shell script below.

ok, clear. so you can handle the HP-UX part. For linux, I would suggest to use the dig command, which has a +short option, it is easy to parse:

# dig +short example.com
192.0.32.10
#

Re: difference nslookup between Linux and HP-UX

Billa-User — Wed, 06 Apr 2011 16:02:35 GMT

hello,

hmm , when i type

dig +short example.com

the command doesn't ask me for an input (ip)

do you have another unix version?
i tried for HP-UX and Linux

Re: difference nslookup between Linux and HP-UX

Billa-User — Wed, 06 Apr 2011 16:18:49 GMT

hello,
i tried some options, now it is ok:

with hostname:
dig server.example.com +short @localhost

with ip-address
dig -x 192.164.170.32 +short @localhost

@ dig +short example.com
do you forget the "server-name" to "dig"?
regards

Re: difference nslookup between Linux and HP-UX

Viktor Balogh — Wed, 06 Apr 2011 18:14:50 GMT

> do you forget the "server-name" to "dig"?

no, I just didn't declared the DNS server IP, it is not a must. I think if you leave the "@localhost" part in your command, it will use the dns server which was specified in /etc/resolv.conf. But not sure if every linux distro works this way, I tried it on OpenSUSE.

Re: difference nslookup between Linux and HP-UX

Steven Schweda — Wed, 06 Apr 2011 19:09:01 GMT

> i want the same output of command "nslookup"

One way to do that is to use the same
"nslookup" program everywhere. If you find
some source, and build it on all your
systems, then you should get similar results
everywhere.