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powercfg /batteryreport /output "%USERPROFILE%\battery_report_2.html" /duration 14

powercfg /energy

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How to check if port is in use in

• sudo lsof -i -P -n | grep LISTEN
• sudo netstat -tulpn | grep LISTEN
• sudo ss -tulpn | grep LISTEN
• sudo lsof -i:22 ## see a specific port such as 22
• sudo nmap -sTU -O

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chmod 700 /home/[your-username]

chmod 700 ~/.ssh

chmod 600 ~/.ssh/authorized_keys

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sudo ufw [COMMAND]

Using IPv6 with UFW

sudo nano /etc/default/ufw - IPV6=yes

Options

status verbose: list all custom and default rules.

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ss stands for "socket statistics", a CLI tool to display information about network sockets on a Linux or Unix-like OS.

ss can be used to display:

• the state of the connection.
• the type of the socket.
• the process that is using the socket.

Note: ss is similar to netstat, but it's generally faster and more efficient when dialing with large numbers of network connections

Options

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lsof stands for list open files, a CLI tool to display infos about the files currently open by processes on a Unix or Unix-like OS.

lsof can be used to identify which processes are using specific files, which files are being used by specific processes, which network connections are open.

Options

-c NAME: filter by process name or command name.

-u NAME: filter by user name or user ID.

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Options

-l: listen for incoming connections

-p: specify the local port to use for the connection

-v: enables verbose output, which can be helpful when debugging

-n: disables DNS resolution, which can speed up connections.

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Options

-a: display all active connections, including those in LISTEN state

-n: don't resolve names (display addresses and port numbers in numerical format, rather than resolving them to host and service names)

-p, --programs: display PID/Program name for sockets.

-l, --listening: display listening server sockets.

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https://stackoverflow.com/questions/9537751/virtualbox-port-forward-from-guest-to-host

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local variable inside for body isn't exported to outside, remember to use set -x option.

Syntax

for <var-name> in $list_variable
	echo $<var-name>
end