lm_sensors (Linux-monitoring sensors), is a free open source software-tool for Linux that provides tools and drivers for monitoring temperatures, voltage, humidity, and fans. It can also detect chassis intrusions.
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libsensors offers a way for applications to access the hardware monitoring chips of the system. A system-dependent configuration file controls how the different inputs are labeled and what scaling factors have to be applied for the specific hardware, so that the output makes sense to the user.