Hi,
The best approach for searching a particular term in code base is to search through your codebase in an IDE like Eclipse which has inbuilt search feature.
From, system console, you can go to Status --> Bundles (http://<host>:<port>/system/console/status-Bundles) which has the full list of bundles, imported , exported package and this can also be downloaded.
Regards,
Ashwin Raju