#!/bin/bash

trap ctrl_c INT

function ctrl_c() {
    echo "Terminated - exit" >&2
    exit 0
}

if [[ $# != 1 ]]; then
    echo  "Point device name, e.g. /dev/encoder_X0" >&2
    exit 1
fi

stty -F $1 -echo

START=$(date +%s)

while read VAL; do
    CUR=$(($(date +%s) - $START))
    echo -e "$CUR.$(date +%N)\t$VAL"
done < $1