I have one file list.fdict which contains recordname and its details.

like :

NAME1:25:C:NAME LINE1:
NAME2:25:C:NAME LINE2:
CITY:25:C:City:
STATE:2:C:State:
ZIPCODE:5:N:ZIPCODE:
PHONE1:12:C:HOME PHONE:
PHONE2:12:C:BUSINESS PHONE:
I want to append news records(22 different records line) to the above file.
for this,
I want to write shell script which first check record exists then dont append
and if not exists then append it.

How do you I write such shell script in efficient way.

Regards,
Amit