zenity

Display dialogs from the command-line/shell scripts. Return user-inserted values or 1 if error. More information: https://manned.org/zenity.

zenity --question

zenity --info --text="Hello!"

zenity --forms --add-entry="Name" --add-password="Password" --separator=";"

zenity --file-selection --directory

(echo "#1"; sleep 1; echo "50"; echo "#2"; sleep 1; echo "100") | zenity --progress