Typo in memory status script

fo_cached=$(($kb_main_free + $buffers_plus_cached))

should be

fo_cached=$(($free + $buffers_plus_cached))

BTW, I changed it to only report the amount of free memory. It seems more useful that way. And I added this to colorize the background red if there's less than 10% free:

if [[ $f -lt 10 ]]; then
        bgcolor='r'
else
        bgcolor='g'
fi
color b $bgcolor w; printf "%s" "$total"; color -; color b $bgcolor K; printf "%s" "$unit"; color --;