Toggle CPU power governor

toggle-cpufreq.sh

#!/bin/bash

CURRENT_GOVERNOR=`cpufreq-info -p | grep -oE '[^ ]+$'`;
NEW_GOVERNOR='performance';

echo "Current governor: $CURRENT_GOVERNOR";

if [ "$CURRENT_GOVERNOR" == "performance" ]; then
	NEW_GOVERNOR="powersave";
fi

read -r -p "Set governor to '$NEW_GOVERNOR'? [Y/n]" response
response=${response,,} # tolower

if [[ $response =~ ^(yes|y| ) ]] || [[ -z $response ]]; then
	sudo echo -n "Setting governor to: $NEW_GOVERNOR on CPUs [ ";

	MAX_CPU=`cpufreq-info | grep -c analyzing`
	CUR_CPU=0
	while [  $CUR_CPU -lt $MAX_CPU ]; do
		sudo cpufreq-set --cpu $CUR_CPU --related --governor $NEW_GOVERNOR;
		echo -n "$CUR_CPU "
		let CUR_CPU=CUR_CPU+1;
	done
	echo ']';
fi