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=== sudo ===
Almost all instructions here start with a "sudo", it basically gives administrative rights to whatever follows, and therefore allows you to do tasks that
*'''sudo halt''' = stops any cpu functions, but leaves Pi running; used when you have reached the end of commands you want to do for now
*'''sudo poweroff''' = makes pi do a tidy shutdown and turn off its power; used when you will not be using Pi for a while
*'''sudo reboot''' = makes pi close down and then reboot; used when you change settings, and after you install new software, to ensure Pi starts with all applications
=== ~ and / ===
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