The link below is one of the best music compilation for programming and focus :D
https://musicforprogramming.net/
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selengkapnya>>Ubuntu Shell Helper, this site help you to explain what shell command mean
https://explainshell.com/
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selengkapnya>>If you want to list all used port on ubuntu server, you can use netstat, example :
netstat -tlnp
Command above will list all port used, t mean tcp, l mean listening port, n mean show numeric, p mean show pid.
Or you can use this helper to explain the command
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