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# 1  
Old 09-29-2015
Dig match
Hi,

I am testing some code to match a grep to see if one of the dns server exists but it does not seem to match:


ERROR:
=======
CRITICAL: google.com DNS : ns3.google.com NOT found

CODE:
=====

Code:
if [`dig +short NS google.com | grep ns3.google.com| wc -l` -eq 1 ]; then

 echo "OK: google.com DNS : ns3.google.com exists"
 
else

 echo "CRITICAL: google.com DNS : ns3.google.com NOT found"
fi

COMMAND:
========
dig +short NS google.com


OUTPUT:
=======

ns3.google.com.
ns2.google.com.
ns4.google.com.
ns1.google.com.


Thanks,
# 2  
Old 09-29-2015
Heya

For some reason this machine has no dig available, so the following is untesteted.
Try:
Code:
SEARCH="ns3.google.com"
RESULT=$(dig +short NS google.com | grep "$SEARCH")
[ "$SEARCH" = "$RESULT" ] && \
    echo "OK: google.com DNS : ns3.google.com exists" || \
    echo "CRITICAL: google.com DNS : ns3.google.com NOT found"

hth
# 3  
Old 09-29-2015
@dmccabe: Your script thorws a different error message than you describe: [1: command not found
This is because there is no space after the square bracket:
Code:
if [ `dig +short NS google.com | grep ns3.google.com| wc -l` -eq 1 ]; then

# 4  
Old 09-29-2015
Damn!

Thank you so much!
# 5  
Old 09-29-2015
The condition could be done as just:

Code:
$ if [[ -n $(dig ns3.google.com +short) ]] ; then ... fi

# 6  
Old 09-29-2015
Thanks Aia!
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