cpufreq-aperf -V (return code: 255)
cpufreq-aperf: unrecognized option '--version'
Error reading /dev/cpu/0/msr, load/enable msr.ko
cpufreq-aperf --help (return code: 0)
cpufreq-aperf [OPTIONS]
-c [ --cpu ] CPU The CPU core to measure - default all cores
-i [ --intervall ] seconds Refresh rate - default 1 second
-o [ --once ] Exit after one intervall
-h [ --help ] This help text
The msr driver must be loaded for this command to work