Get CPU temperature on Linux - Linux Tutorials - Learn Linux Configuration

The ability to get the temperature of a key component such as a CPU is important, whether you are gaming, overclocking, or hosting intensive processes on a critical server for your company. The Linux kernel comes with modules built in that allow it to access onboard sensors within the CPU. In this tutorial, you will learn how to access these sensors and get the CPU temperature on a Linux system.

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I use GNU Krell Monitors
With a single process, gkrellm manages multiple stacked monitors and supports
applying themes to match the monitors appearance to your window manager, Gtk,
or any other theme.