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=== sudo ===
Almost all instructions, heregiven in this article, start with a "sudo", it basically gives administrative rights to whatever follows, and therefore allows youa standard Pi user to do tasks that otherwise only work infor the root user. You use it as a prefix to almost every command you type in terminal mode. There are 3 system commands that in terminal mode will only ever work with this prefix (although if you have installed the version of the Raspberry Pi Operating System that supports a graphical user interface you can also select these actions from a menu):
*'''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 your Pi for a while
*'''sudo reboot''' (or "sudo reboot -verbose" for diagnostic output during shutdown and reboot) = makes piyour Pi close down and then reboot; used when you change settings, and after you install new software, to ensure Pi starts with all applications running using the latest settings and latest already installed software
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