Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
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BCC is a toolkit for creating efficient kernel tracing and manipulation programs leveraging extended Berkeley Packet Filters (eBPF).
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webmin, cloudmin, usermin
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id, adduser, gpasswd (recommended for adding/removing groups)
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uptime, top, netstat, ifconfig, top, iotop (input and output monitoring), atop,
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htop (a better alternative to top)
osquery
References
https://www.tecmint.com/command-line-tools-to-monitor-linux-performance/
https://blog.serverdensity.com/80-linux-monitoring-tools-know/