In 4.1, use sdcli.exe down in the bin directory to run the following SQL Developer features from the command line...
cart: Database Cart Batch Tasks
dba: Basic Batch DBA Tasks
format: Utility Import Task
migration: Database Migration Tasks
reports: Basic Batch Reporting Tasks
unittest: Unit Testing Batch Tasks
utility: Utility Import Task
For the beta version of the new sqlplus over JDBC command line tool, use sql.exe in the same bin directory.