https://ops.docs.72602.space/linux/cheatsheet/index.html useradd sudo useradd <$name> -m -r -s /bin/bash -p <$password> add as soduer echo '<$name> ALL=(ALL) NOPASSWD: ALL' >> /etc/sudoers telnet a command line interface for communication with a remote device or serve telnet <$ip> <$port> for example telnet 172.27.253.50 9000 #test application connectivity lsof (list as open files) everything is a file Hugo en