Print a clockwise-spinning pinwheel on an ANSI-compliant terminal.

terminal-pinwheel.rb

#!/usr/bin/env ruby

begin
    
    loop do
        %w( ◐ ◓ ◑ ◒ ).each do |pchar|
            print "\x1b[1G\x1b[0K#{pchar} "
            sleep 0.1
        end
    end

rescue Exception
    # goodbye
    print "\x1b[1G"
end

Use ^c to exit.