There are MANY options of Rosette Base Linguistics (RBL), and hence there are many options of the command line tool (RBLCmd). This article shows the quickest path to experimenting with RBLCmd using the minimum set of arguments.
On command line, navigate to rbl-je-<version>/tools/bin:
/RBLCmd --rootDirectory ../.. -inFile "input.txt" -outFile "output.txt" --language eng
Add "showTokenDetails=true" to show Part Of Speech (POS) tagging.
For the full help text: