Read Serial with linux:
https://wiki.archlinux.org/index.php/arduino#Accessing_serial
Note: As autoreset on serial connection is activated by default on most boards, you need to disable this feature if you want to communicate directly with your board with the last command instead of a terminal emulator (arduino IDE, screen, picocom...). If you have a Leonardo board, you are not concerned by this, because it does not autoreset. If you have a Uno board, connect a 10 µF capacitor between the RESET and GND pins. If you have another board, connect a 120 ohms resistor between the RESET and 5V pins.

stty -F /dev/ttyACM0 cs8 9600 ignbrk -brkint -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke noflsh -ixon -crtscts


Oppure dopo il stty fare un 
cat </dev/ttyACM0

per redirigere su un file:
 cat </dev/ttyACM0 > prova


 sul quale si puo' fare un tail -f
 ----------
 attaching to a serial tty
     In GNU Screen, you can connect to a serial device (screen -r /dev/ttyS0 115200). Tmux does not support this feature. 

si puo' anche usare screen:

screen /dev/ttyACM0 9600

Magic codes are [CTR]A -- d n a "

-----
See also http://playground.arduino.cc/Interfacing/LinuxTTY