shows how much ram and program space is used by a compiled program

avr-size.sh

#!/bin/bash

# http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=792113#792113
# ".data+.bss+.noinit is the initial RAM allocation."

# AVR Memory Usage
# ----------------
# Device: atmega328p
# 
# Program:   12580 bytes (38.4% Full)
# (.text + .data + .bootloader)
# 
# Data:        960 bytes (46.9% Full)
# (.data + .bss + .noinit)

mcu="atmega328p" # attiny85, etc.
avr-size --format=avr --mcu=${mcu} "${0}"