Show notification window

zenity --error --text="Hellow" --title="Patata" --timeout=2

Rebuild font cache

$ fc-cache -f -v

Update alternative

Set another path to bin for program

sudo update-alternatives --config java

Insert unicode char

Press Shift+Control+u then the unicode character's code. e.g.

Shift+Control+u

then

01b8

to get

Ƹ