tty-clock usage : tty-clock [-option]
    -s            Show seconds
    -c            Set the clock at the center of the terminal
    -C <num>      Set the clock color
    -t            Set the hour in 12h format
    -r            Do rebound the clock
    -f <format>   Set the date format
    -v            Show tty-clock version
    -i            Show some info about tty-clock
    -h            Show this page