LibCpufreq is a library which offers a unified access method for userspace tools and programs to the cpufreq core and drivers in the Linux kernel. This allows for code reduction in userspace tools, a clean implementation of the interaction to the cpufreq core, and support for both the sysfs and proc interfaces.
Cpufreq-info determines current cpufreq settings, and provides useful debug information to users and bug-hunters.
Cpufreq-set allows to set a specific frequency and/or new cpufreq policies.
To install cpufreq-info use the following command
apt-get install cpufrequtils