Get/Set Fan Speeds for AMD Video Cards in Linux

I'm messing around with GPU cracking and I've been changing fan speeds manually a lot so I wrote a script to do it for me. This script will output the temperature & fan speed of the two cards in my system, as well as allow me to set the fan speeds for either/both:

#!/bin/bash
#ati-stats.sh - gives environmental stats about the ATI videocards. this assumes you have two cards
get_fan_speed () {
        DISPLAY=:0.${1}
        aticonfig --pplib-cmd "get fanspeed 0" | grep '%' | cut -d ':' -f 3
}

set_fan_speed () {
        DISPLAY=:0.${1}
        aticonfig --pplib-cmd "set fanspeed 0 ${2}"
}

get_temp () {
        aticonfig --adapter=${1} --odgt | grep Temp |cut -d '-' -f 2
}
if [[ -z ${1} ]]; then #if no arguments then output stats
        echo "0: $(get_temp 0) --$(get_fan_speed 0 )"
        echo "1: $(get_temp 1) --$(get_fan_speed 1 )"
else
        case ${1} in
                get)
                        get_fan_speed ${2}
                        ;;
                set)
                        oldspeed=$(get_fan_speed ${2})
                        set_fan_speed ${2} ${3}
                        echo "${2}: ${oldspeed} -> $(get_fan_speed ${2})"
                        ;;
                setboth)
                        oldspeed=$(get_fan_speed 0)
                        set_fan_speed 0 ${2}
                        echo "0: ${oldspeed} -> $(get_fan_speed 0)"
                        oldspeed=$(get_fan_speed 1)
                        set_fan_speed 1 ${2}
                        echo "1: ${oldspeed} -> $(get_fan_speed 1)"
                        ;;
                *)
                        echo "Usage: $0 [get Adapter_NUM | set Adapter_NUM fan_PERCENT | setboth fan_PERCENT]"
                        ;;
        esac;
fi;