Different kind of "history" (maybe the term is not proper): I am referring to how many lines the commands you executed can output in the terminal before the oldest lines are lost (scrolling up, you will not reach the first command you executed after launching the terminal emulator). There is a limit to avoid that a command that prints gazillion lines (say a 'cat' of large files) make the process of the terminal emulator fill up the whole main memory (to be able to show you these lines, the terminal emulator must store them).

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