Script question for BIND

I need to or want to delete BIND DNS entries that match A records from another file. If the DNS entry has multiple records associated to it in File2, those need to remove too.

File1

• car.example.com 192.168.10.1

• truck.example.com 192.168.10.2

• bike.example.com 192.168.10.5

File2

• car.example.com 192.168.10.1, 192.168.10.10, 192.168.10.20

• truck.example.com 192.168.10.2

• bike.example.com 192.168.10.5, trek.example.com

After the removal, I need or would like to add new entries for the entries that were removed into File2.

• car.example.com 172.10.1.12

• truck.example.com 172.10.1.15

• bike.example.com 172.10.2.20

I tried a few grep. awk commands etc. I was able to remove the entry but not if the entry had multiple entries associated to it. However when I tried to start named.service it would fail.

Code:grep -vwf file1 file2Code:grep -f <(cat file1 | sed 's/^/^/' ) file2