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    分享篇老文 Tutorial - Write a Shell in C
    之前使用 Golang 写过 一个简易的 Shell,原理很简单。
    文中介绍了下:Let’s look at a shell from the top down. A shell does three main things in its lifetime.
    Initialize: In this step, a typical shell would read and execute its configuration files. These change aspects of the shell’s behavior. Interpret: Next, the shell reads commands from stdin (which could be interactive, or a file) and executes them. Terminate: After its commands are executed, the shell executes any shutdown commands, frees up any memory, and terminates.