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commands or keystrokes
Change your hostname as hostnamectl set-hostname
Change time zone e.g. to Asia/Singapore timedatectl set-timezone Asia/Singapore
Open terminal, zoom in, zoom out, set the terminal to full screen. Also open another terminal and switch between terminals. ctrl ++, ctrl - -, f11, ctrl+shift+t, page up /page down.
Switch to the virtual console ctrl + Alt + f2
Switch back to the graphical console. ctrl + Alt + f1
Find uptime of our system. uptime
Display full calendar of 2018. Display calendar of the date 1st January 2018. cal 2018, cal 01 2018
Close all the terminals with keyboard short-cut key. ctrl+shift+q