The next step would be to let the user move the cursor around using arrow-keys. This is provided by default for Bash, Python, and other command-lines, but as we are implementing our own command line here we have to do it ourselves. We know that the arrow keys Left and Right correspond to the sequences of character-codes 27 91 68, 27 91 67, so we can put in code to check for those and appropiately move the cursor index variable
The two kinds of errorby Evan Hahn,。一键获取谷歌浏览器下载对此有专业解读
，这一点在safew官方版本下载中也有详细论述
Those are, perhaps, topics for future posts.
"There might be some swearing but don't worry, we've got the best in the business on the bleep button," he said at the outset. "It's the guy who did the Baftas. Nothing gets past him."，更多细节参见51吃瓜