 So you may be familiar with the bash read command. You can say read and then you can also, if you're in bash, give it a prompts like enter info and then you give it a variable and it will put whatever the user enters into that variable. I'll call it MSG and I can say hello and then I can echo out that variable like such. But let's say the user is inputting something such as hello there and they wanna go back and change something. If they try to use the left arrow key to go back, you're going to get this. So the only way for them to go back is to erase what they've typed. But you can add in the dash E flag here and now they can say hello there and they can use the arrows to move around and type whatever they want.