xterm is a window in a X environment like a window in MS windows XP for example. In that windows you can use many commands with many options to do your tasks; with mistakes you can bring down the machine if you have privileges to do so.

Even we are at this point; machines are still not there yet in order to know exactly what we want; therefore, commands have to be clear. So there come those spaces between commands and their options.

Actually you can save space by moving lot of functions to mmc1 or mmc2. But are you prepared to what would happen if you forget and take out the mmc1 while the IT is using it ? Do you know how to fix after that?

That's why you should read more about how to clone the SD that is a way to move the whole thing out from flash to the mmc.

Try to use the search function and you will learn more.