#!/bin/bash

function size_format
{
	local size=$1

	local prefix=(B K M G T P E Z Y)
	local n=0
	local i=
	while true; do
		i=$((size/2**(10*n)))
		(( i < 1024 )) && break
		((n++))
	done

	echo "${i}${prefix[$n]}"
}