$ curl cheat.sh/
# zenity
# Display dialogs from the command-line/shell scripts.
# Return user-inserted values or 1 if error.
# More information: <https://manned.org/zenity>.

# Display the default question dialog:
zenity --question

# Display an info dialog displaying the text "Hello!":
zenity --info --text="Hello!"

# Display a name/password form and output the data separated by ";":
zenity --forms --add-entry="Name" --add-password="Password" --separator=";"

# Display a file selection form in which the user can only select directories:
zenity --file-selection --directory

# Display a progress bar which updates its message every second and show a progress percent:
(echo "#1"; sleep 1; echo "50"; echo "#2"; sleep 1; echo "100") | zenity --progress

$
Follow @igor_chubin cheat.sh tldr