help with AWk

[Eric Schuele]

On 09/27/2008 22:06, Len Conrad wrote:
> The logic desired if
> 
> If IP has no PTR, print "PTR_NUL", else print the PTR.
> 
> 
> dig +short -x 1.2.3.4 | awk '{if ( $0 == "" ) {print "PTR_NUL" } else {print $0 } }'
> 
> ... works if PTR exist, but if no PTR, PTR_NUL doesn't print.

A workaround that does the trick...

printf "dug `dig +short -x 1.2.3.4`" | awk '{if ( NF == 1 ) {print
"PTR_NUL" } else {print $2 } }'

> 
> thanks
> Len
> 
> 
> 
> 
> 
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-- 
Regards,
Eric


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