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There is nothing in ROS that prevents you from doing what you would normally do with python or C++. For example in python you could simply do this:

import os
os.system('get_hrv -R test.txt')

(Just a note, os.system is easy to use but is slowly being replaced by subprocess which isn't as easy to use in my opinion but is more capable. The main point is like rbbg said, this is really a python or C++ question, the fact that you want to do it with ROS doesn't really change anything).