usage : tty-clock [-sctrvih] [-C [0-7]] [-f format]
    -s            Show seconds
    -c            Set the clock at the center of the terminal
    -C [0-7]      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
    -b            Disable border line