BASH: grep/awk/sed to extract variable data

Question

UPDATE I need to clarify that Jon8RFC-LT and DOMAIN are also just generic examples of dynamic content, like the IP address and MAC address; nmblookup retrieves and displays entirely dynamic content based on the ip address. If awk is used, I need to have a way to pull 4 dynamic values from the nmblookup: IP, hostname/asset name, domain name, MAC address. Sorry for the confusion, I updated the code to make it more clear.

I have been searching and using my Linux book for a couple of days and cannot find what I need for awk/gawk/grep/egrep/sed (I think I need one or more of those, elegantly). In a bash script, I'm running:

su_nmblookup=$(nmblookup -A $ipaddress)

which returns

WARNING: The "idmap backend" option is deprecated
added interface eth0 ip=a07d::a07d:a07d:a07d:a07d%eth0 bcast=b57d::ffff:ffff:ffff:ffff%eth0 netmask=ffff:ffff:ffff:ffff::
added interface eth1 ip=b57d::b57d:b57d:b57d:b57d%eth1 bcast=a07d::ffff:ffff:ffff:ffff%eth1 netmask=ffff:ffff:ffff:ffff::
added interface eth0 ip=234.234.234.234 bcast=12.12.12.12 netmask=255.255.0.0
Socket opened.
 Looking up status of 123.123.123.123
    JON8RFC-LT <00> -         B <ACTIVE> 
    DOMAIN        <00> - <GROUP> B <ACTIVE> 
    JON8RFC-LT <20> -         B <ACTIVE> 
    DOMAIN        <1e> - <GROUP> B <ACTIVE> 

    MAC Address = 4F-A2-4F-A2-4F-A2

The best I've managed, is to chop it down with this code:

display=${su_nmblookup/#*Looking/\Looking}

Looking up status of 123.123.123.123
    JON8RFC-LT <00> -         B <ACTIVE> 
    DOMAIN        <00> - <GROUP> B <ACTIVE> 
    JON8RFC-LT <20> -         B <ACTIVE> 
    DOMAIN        <1e> - <GROUP> B <ACTIVE> 

    MAC Address = 4F-A2-4F-A2-4F-A2

However, what I'd like to know is how to return either of these cleaned up formats. I want to learn how the grep/awk/sed works with extracting data with these two examples, one with preserving the formatting, and one with just new lines. I had a hell of a time even getting the quoting/coding to work properly here because of the formatting and gt/lt symbols!

Looking up status of 123.123.123.123
    JON8RFC-LT
    DOMAIN
    4F-A2-4F-A2-4F-A2

OR, simply

JON8RFC-LT
DOMAIN
123.123.123.123
4F-A2-4F-A2-4F-A2

Thank you for your help!

Answer 1

Assuming the output of nmblookup -A 123.123.123.123 is redirected to file input.txt

awk '/Looking up status of/ {print} /JON8RFC-LT/ {if(a!=1){print "\t"$1;a=1}} /DOMAIN/ {if(b!=1){print "\t"$1;b=1}} /MAC Address/ {print "\t"$4}' input.txt

Updated as Etan Reisner suggested to be shorter:

awk '/Looking up status of/ {print} /JON8RFC-LT/ && !a {print "\t"$1;a=1} /DOMAIN/ && !b {print "\t"$1;b=1} /MAC Address/ {print "\t"$4}' input.txt

output:

 Looking up status of 123.123.123.123
    JON8RFC-LT
    DOMAIN
    4F-A2-4F-A2-4F-A2

Updated for Dynamic content

awk '/Looking up status of/,/MAC Address/ {print; getline;print "\t"$1;getline;print "\t"$1;getline;getline;getline;getline;print "\t"$4;exit 0}' input.txt

Assumes on the two lines after line Looking up ... you want the first word. Then ignores three lines and then prints MAC address.