Bash Scripting Output

Question

So my bash scripting is not the best, but the following script takes IP addresses from a text file and feeds the output to a shell and shows only the dns host names that resolve.

#!/bin/bash
while read line
do
dig @1.2.3.4 -x  "$line" +short
done

and the output would look like:

one.foo.local
two.foo.local
three.foo.local

How can I also print the ip address for the address that resolve to a dns name on the same line so it would appear like:

one.foo.local 2.3.4.5
two.foo.local 6.7.8.9
three.foo.local 7.5.3.1

Thanks

Answer 1

You can try something like:

#!/bin/bash
while read line
do
nme=$(dig @1.2.3.4 -x  "$line" +short)
if [ "$(echo "$nme"|wc -c)" -gt 1 ]
   then
    echo "$nme $line"
fi 
done<input_file