bash argsparse 介绍
bash argsparse 是一个 Bash 的高级参数解析库。
Its purpose is to replace the option parsing and usage describing functions
commonly rewritten in all scripts. Its features include automatic help message
generation, user input checking (type checking, enumerations, etc.), and
option properties (mandatory options, option aliases, options excluding each
others, etc.). It is implemented for bash version 4. Prior versions of bash
will fail at interpreting the code.