The shell: what? It's what you're using in the terminal

摘要

While there are many elements that contribute to the Zen of Unix, understanding the shell is, if not the pinnacle of this list, pretty close to it. To truly grasp not only the basics of shell use and programming, but also what is going on when you press 'return', will increase your skills considerably. This month's column will introduce us to 'the' shell, and demonstrate some substantial uses.