#!/bin/sh

FILE=$1

if [ ! -e ${FILE} ]; then
        exit $(false)
fi

function get_size() {
        stat -c %s $1
}


size_a=$(get_size ${FILE})
sleep 1
size_b=$(get_size ${FILE})

if [ $size_b -gt $size_a ]; then
        TRANS=$(($size_b - $size_a))

        if [ $TRANS -gt 1048576 ]; then
                OUT=$(($TRANS / 1048576))
                UNIT="MB/s"
        elif [ $TRANS -gt 1024 ]; then
                OUT=$(($TRANS / 1024))
                UNIT="KB/s"
        else
                OUT=$TRANS
                UNIT="Bytes/s"
        fi

        echo "${FILE} ${TRANS} ${OUT} ${UNIT}"
else
        echo "${FILE} not growing"
fi