David Warshaw
Python 3 is required.
tar -zxvf rpn.tar.gz
cd rpn-package
python setup.py install
Launch in interactive mode. Exit with ctrl-d or 'exit':
rpn
Evaluate expression from command line, outputting top stack operand:
rpn [expression]
Evaluate expression from each line of stdin, outputting top stack operand:
cat expressions.list | rpn
Print the help screen:
rpn --help