Options (LOADERCLI) 

When you call the SAP DB Loader with the SAP DB Loader CLI (LOADERCLI), you can specify a number of options for the SAP DB Loader. For a list of all possible options, see SAP DB Loader: SAP DB 7.4, Section Options.

To connect to the database instance on the local server, you must enter at least option -d <database_name>. In addition, you must specify the name of a command file in option -b <command_file>.

You want to specify the following user data as options: database user  and the name of the database instance

loadercli -u samplename,secret -d TST -b command.dat

The Loader is called and a database session is created for the database user samplename, password secret, with the database instance TST. All further commands statements can be found in command file command.dat.