Nmon - a nice monitoring tool for Linux

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http://www.linuxandlife.com – Although not as popular as top or htop, nmon is still one of the best monitoring tools for Linux. Nmon is a tuner, benchmark and system administrating tool. Nmon displays many system performance info cpu, memory, hard drive, network .. By default, nmon updates output data once every two seconds. However, you can easily change this interval to any time period that you prefer. Perhaps the nicest feature of nmon is you can also it to capture data for a period in spreadsheet output format (.csv) to study or write performance report, which can be very useful if you are administrating a linux dedic (Distributions)