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| optparse-package | Command line option parser |
| add_option | Functions to enable our OptionParser to recognize specific command line options. |
| make_option | Functions to enable our OptionParser to recognize specific command line options. |
| OptionParser | A function to create an instance of a parser object |
| optparse | Command line option parser |
| parse_args | Parse command line options. |
| print_help | Printing an usage message from an OptionParser object |