sar

The sar command is a useful command line tool in Unix and Unix-like operating systems. It stands for System Activity Reporter. The primary purpose of sar is to collect, report, and analyze system activity data such as CPU usage, memory usage, disk I/O, network traffic, and more. It allows system administrators to monitor system performance and identify bottlenecks or issues. Sar gathers data at regular intervals and stores it in binary files that can be later analyzed or retrieved. It offers various options and flags to customize the output, including the ability to view historical data or generate reports in different formats. Sar is widely used in troubleshooting, performance tuning, capacity planning, and analyzing system behavior over time. It is a versatile tool that provides valuable insights into system activity and performance.