I have been using Emacs shell mode for some time, but one thing keeps bothering me. After I split the window vertically with Ctrl+3, invoke M-x shell and fill the window with commands and output, whenever I execute a command, the pointer jumps to the middle of the screen, where there are usually outputs of previous command. I could Alt+> to jump to where the new prompt is, but that is tedious. However, Emacs works well if I do not split the window, i.e. keeps the pointer at the bottom of the screen.

Another fact (not the same question) that I happened to found is that I could keep all the outputs in the upper half of the screen, while leaving the lower half blank. Is this triggered by some shortcut?

For clarification, I just want my Emacs shell's output behave like a common shell like bash, i.e. keeps the pointer at the bottom. The pointer in emacs sometimes jumps to the middle of the screen after I enter a command.

Hopefully I have made myself understood.