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for windows, replace /dev/tty.usb* with /dev/ttyS0 (instead of COM1 per http://www.avrfreaks.net/wiki/index.php/Documentation:Things_That_Are_Broken#Mega128_Programming)
Check Device Manager for COM assignment:
S0 == COM1
S1 == COM2
S2 == COM3
S3 == COM4
the path to the hex file must be absolute and fully specified, or in current dir