When you start learning something new, it’s normal that you won’t know all commands by heart. That comes much later after hours of practice. Cheat sheets comes in handy in those times when you are still working on memorising commands. System uname Displays Linux system information uname -r Displays kernel release information uptime Displays how long the system has been running including load average hostname Shows the system hostname hostname -i Displays the IP address of the system last reboot Shows system reboot history date Displays current system date and time timedatectl Query and change the System clock cal Displays the current calendar month and day w Displays currently logged in users in the system whoami Displays who you are logged in as finger username Displays information about the user General su Switches user. - <user> Switches to user. - Switches to root. man Help on commands. <section> Section numbers: 1.....