342630 Script to merge CSV docs

Hi We need a solution for our data. We have a master CSV file with thousands of companies arranged into columns. Columns are, Name, email, address1, Address 2, etc. We need a script than will run other CSV's against the master that will - Search for Duplicate company names and mark them. - Then provide and option to review the data for the duplicate company one by one - To be able to "add, replace, merge,ignore" data. (ie) Company Name: John Smith Interiors, smith street, london, E8 FGY Duplicate Found: Company Name: John Smith Interiors, 212 smith street, london, E8 FGY, 07832 714997,info*[login to view URL] The script will allow us to build and maintain our data base accuracey by: 1. ADD new data to EMPTY cells for example - The email column 2. REPLACE data where new data is more accurate and up to date-such as a new address 3. MERGE data where we are adding new keywords which tag the products that company sells 4. IGNORE data when the master data is the preferred choice [login to view URL] - Unique and new companies to the master Its must also Mark with some kind of symbol against the duplicates - so we can see which are unique ( and therefore added to master automatically ) and which are already in the master. We have been using our web SQL database to do this - and have a script - but need something a step more comprehensive. Thanks Helen