command line - How to launch GUI app (in Ctrl+Alt+F7) from tty (Ctrl+Alt+F1-F6)

I want to know that how can I launch GUI apps from tty (Ctrl+Alt+F1-F6) into GUI mode (Ctrl+Alt+F7)

Sometimes, users having problem with GUI mode like: can login to GUI but Launcher is not working or unable to open even terminal from shortcut. Then this can help to launch essential applications from tty

You can specify DISPLAY environment to specify display for launching apps (see Graphical Environment) as follows from tty:

DISPLAY=:0 

Example:

DISPLAY=:0 gedit
DISPLAY=:0 gnome-terminal

This will launch GUI applications in GUI mode (Ctrl+Alt+F7) from tty (Ctrl+Alt+F1-F6).