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https://www.tecmint.com/useful-linux-commands-for-system-administrators/
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https://insights.hpe.com/articles/16-linux-server-monitoring-commands-you-really-need-to-know-1703.html
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http://www.thegeekstuff.com/2011/12/linux-performance-monitoring-tools/
http://www.networkworld.com/article/2937219/linux/7-command-line-tools-for-monitoring-your-linux-system.html
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http://xmodulo.com/useful-command-line-network-monitors-linux.html
https://insights.hpe.com/articles/16-linux-server-monitoring-commands-you-really-need-to-know-1703.html

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