print current energy consumption of (AMD?) CPU every second, on Linux

energy.sh

#!/bin/bash

export LC_ALL=C
VAL=`cat /sys/class/powercap/intel-rapl:0/energy_uj`

while true ; do
	# yes, this is probably not super-precise due to just using sleep and not measuring the time..
	sleep 1
	NEWVAL=`cat /sys/class/powercap/intel-rapl:0/energy_uj`
	DIFF=$(($NEWVAL-$VAL))
	WATTS=`echo $DIFF/1000000 | bc -l`
	printf "%.3f W\n" "$WATTS"
	
	VAL=$NEWVAL
done