DNS: Command to delete a line containg specific from all *.db files in server

If you want to delete line containing the string "ns1.<domain_name>.com" from all *.db extention in the server.

Change directory by,

# cd  /var/named/

Run the command below,

# sed -i '/ns1.<domain_name>.com./d' *.db

Note: The above commamd will delete the line specified by the string "ns1.<domain_name>.com "  from all *.db files in the server .