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Can I reset an Arduino using Serial?

Yes. Serial provides a "Flash DTR" command, accessible while the Option/Alt key is held down within the "Terminal" menu. This will toggle the DTR line which on most Arduino boards is connected through a capacitor to the reset line. If your board has an FTDI USB to serial chip it is probably configured this way. Some newer boards do not use a discrete USB to serial chip however and may need to be reset manually.