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    That is simply a convention made-up by whoever wrote that tutorial, and you shouldn't think too much about it. On Unix, the exit status is either success (0) or failure (anything but 0). There were efforts to standardize a set of meaningful error exit statuses (look at /usr/include/sysexits.h), but they didn't really catch on. Commented Mar 6, 2019 at 10:31
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    warning: the script's variables should be in lowercase... otherwise you risk "collision" with internal variables of your shell (ex here: LINES, which in many shells is (re-)set to the number of lines of the terminal emulator, and therefore could possibly change if the window is resized during the script's execution?) Commented Jul 8, 2019 at 14:09