从Ruby调用Shell命令 - Calling shell commands from Ruby

问题：

How do I call shell commands from inside of a Ruby program? 如何从Ruby程序内部调用Shell命令？ How do I then get output from these commands back into Ruby? 而后如何将这些命令的输出返回到Ruby？

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解决方案：

参考一： https://stackoom.com/question/a0/从Ruby调用Shell命令
参考二： https://oldbug.net/q/a0/Calling-shell-commands-from-Ruby