I'd recommend not to do this with a unix script.
For this little cleanup you introduce a lot of additional complexity into your solution and you can perform the type transformation easily in SAP HANA.
Also, SAP HANA assumes that it's the only main resource user on the system - putting on additional software, like your script, can lead to performance issues due to resource (CPU, memory) shortage.
Concerning the view types the general recommendation is in the developer guide - all model types are available for development and none of them are "marked for deprecation".
When you take the position that it's nicer to only have calculation views or if you develop with the WEB IDE exclusively then doing everything in calculation views is the way to go.
Since you can convert analytic and attribute views to calculation views I'd say you don't loose anything with either option.
- Lars