cpufreq-set+sensors

#!/bin/bash

cpuexec=/usr/bin/cpufreq-set

usage () {
    printf "usage: cpu -p | -o | -pp | -f FREQ
    -p|--powersave      switch to powersave
    -o|--ondemand       switch to ondemand
    -pp|--perf          switch to performance
    -f|--freq           manually set freq
    -h|--help           show this help\n"
}

check () {
    sensors | grep '^temp'
    cat /proc/cpuinfo | grep '^cpu\ MHz'
    if [ -n "$governor" ]; then
        echo "Switched to $governor governor"
    elif [ -n "$freq" ]; then
        echo "Switched manually to $freq MHz"
    fi
}

set_governor () {
    if [ -s '$governor' ]; then
        usage
    elif [ -f $cpuexec ]; then
        sudo $cpuexec -g $governor && check
    fi
}

set_freq () {
    $cpuexec -f "$freq"MHz && check
}

while true ; do
    case "$1" in
        -p|--powersave) governor="powersave" && set_governor ; exit 1 ;;
        -o|--ondemand) governor="ondemand" && set_governor ; exit 1 ;;
        -pp|--performance) governor="performance" && set_governor ; exit 1 ;;
        -f|--freq) freq=$2 && set_freq ; exit 1 ;;
        -h|--help) usage ; exit 0 ;;
        *) check ; exit 0 ;;
    esac
done