Monitoring CPU frequency is crucial for understanding the performance and power consumption of your Linux system. In Linux, you can easily check and manage CPU frequency using various command-line tools. This article will guide you through the process of monitoring and adjusting CPU frequency in a Linux environment.

Examples:

1. Using lscpu:
   The lscpu command provides detailed information about the CPU architecture, including its frequency.

   lscpu | grep "MHz"

   This command will display the current CPU frequency in megahertz (MHz).

2. Using /proc/cpuinfo:
   The /proc/cpuinfo file contains information about the CPU, including its frequency.

   cat /proc/cpuinfo | grep "MHz"

   This command will list the frequency of each CPU core.

3. Using cpufreq-info:
   The cpufreq-info command, part of the cpufrequtils package, provides detailed information about CPU frequency scaling.

   First, install cpufrequtils if it's not already installed:

   sudo apt-get install cpufrequtils

   Then, run:

   cpufreq-info

   This command will give you detailed information about the current frequency, available governors, and more.

4. Adjusting CPU Frequency with cpufreq-set:
   You can also adjust the CPU frequency using cpufreq-set. This is useful for power management and performance tuning.

   For example, to set the CPU to a specific frequency:

   sudo cpufreq-set -f 1.2GHz

   Or to set the CPU governor to "performance" for maximum frequency:

   sudo cpufreq-set -g performance

   To set it back to "ondemand" for dynamic frequency scaling:

   sudo cpufreq-set -g ondemand

5. Using watch with lscpu:
   To continuously monitor CPU frequency, you can use the watch command with lscpu.

   watch -n 1 "lscpu | grep 'MHz'"

   This command will update the CPU frequency information every second.