$ curl cheat.sh/
# gnome-calculator
# The official calculator for the GNOME desktop environment.
# More information: <https://wiki.gnome.org/Apps/Calculator>.

# Launch the GNOME Calculator GUI:
gnome-calculator

# Solve the specified equation on the command-line without launching the desktop application:
gnome-calculator --solve 2^5 * 2 + 5

# Display the version:
gnome-calculator --version

$
Follow @igor_chubin cheat.sh tldr