Shell Programming and Scripting

Hello.

The idea is to query a DNS to check de NS record, if the domain name exist in table, print "Is authoritative" else " Not authoritative"

I don´t know if to use "awk" and "grep" creating a /tmp/file then read ir from there or what...

#!/bin/bash
clear
echo -n "First DNS to query: "
read dns
echo -n "Domain name to check: "
read domain
echo "`dig @$dns $dominio ns`"
if [ #here is my problem# ]
then
echo "DNS for $domain is authoritative"
fi
else
echo " DNS is NOT authoritative for $domain"


Sorry guys, need HELP.

Your other duplicate post was deleted - please read the rules

what would be the output of dig @$dns $dominio ns ??
you want to check based on this output right ??

The output would be something like this.

It is an ordinary DIG query.

dig @(server) (domain name) (query type)

E.G.

; <<>> DiG 8.3 <<>> @ns1.sitelutions.com unix.com
; (1 server found)
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 65394
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 5, ADDITIONAL: 5
;; QUERY SECTION:
;; unix.com, type = A, class = IN

;; ANSWER SECTION:
unix.com. 1H IN A 144.202.242.190

;; AUTHORITY SECTION:
unix.com. 30M IN NS ns1.sitelutions.com.
unix.com. 30M IN NS ns2.sitelutions.com.
unix.com. 30M IN NS ns3.sitelutions.com.
unix.com. 30M IN NS ns4.sitelutions.com.
unix.com. 12H IN NS ns5.sitelutions.com.

;; ADDITIONAL SECTION:
ns1.sitelutions.com. 2D IN A 66.117.40.216
ns2.sitelutions.com. 1M IN A 69.26.176.28
ns3.sitelutions.com. 2D IN A 63.219.151.5
ns4.sitelutions.com. 2D IN A 82.96.97.28
ns5.sitelutions.com. 2D IN A 69.93.94.154


This is what matter for me: flags: qr aa rd >> aa

The first issue is that he hasn't checked his spelling:

Change dominio to domain to get this to start working a little better.

Second, check syntax of the IF statement. elif, else, and fi. See the man page for bash inbedded if statement.

Third, either use a temporary file to put the output into so you can use your choice of grep/awk to find what you are looking for - if it's found (grep -c will give you the number of times a string was found) then output something, else output something.

Excellent.

ok, the dominio to domain will be changed.

I will read the "man" for grep (-c), could you give me a little push on how do I need to write the statement IF with GREP ?

If you can´t, no problem, it was a great help.

Thanks a lot. !!!

There are many topics discussed using grep for this kind of stuff, here is one link https://www.unix.com/showthread.php?t...highlight=grep

look for the user "new2prog" post....

Please also search the forum before posting your question....