This is my second post. In my post, I mainly output what I learned that day. I would appreciate it if you could point out in the comments if the expression is inappropriate or if there are any mistakes. Thank you.
hostname → Command used to confirm the user's host name
name -m → Command used to check the number of bits
less [filename] → Check the contents of the file
id username → A command that allows you to check the id and main group without switching the user.
ss -ant → A command to use when you want to check if the port is up.
cd [directory] → Commands used to move directories
ls → Command used to check the directory
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