1 define interface for your command-line app, and
2 Apart from this special meaning, " -- " is just a normal command, so you can apply any previously-described operations, for example, make it require..
3 Usage: my_program [options] [--] <file>...
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@lswdev: docopt - CLI(command-line interfaces)의 usage와 option을 기술하면 자동으로 파서를 생성해주는 도구 http://t.co/fsLtBl2bBY