Most hacker types don’t mind a command line interface, but very few ordinary users appreciate them. However, if you write command line programs in Python, Gooey can help.

The demo Python script is a simple calculator that works from the command line, and [BioBootloader] introduces a few bugs to it.

This is a pretty classic way to parse and process command-line arguments, actually. Check the value of $1, and if it's a known flag, change a default variable or two, then use the shift command to ...