usage : tty-clock [-iuvsScbtrahDBxn] [-C [0-7]] [-f format] [-d delay] [-a nsdelay] [-T tty]
-s Show seconds
-S Screensaver mode
-x Show box
-c Set the clock at the center of the terminal
-C [0-7] Set the clock color
-b Use bold colors
-t Set the hour in 12h format
-u Use UTC time
-T tty Display the clock on the specified terminal
-r Do rebound the clock
-f format Set the date format
-n Don't quit on keypress
-v Show tty-clock version
-i Show some info about tty-clock
-h Show this page
-D Hide date
-B Enable blinking colon
-d delay Set the delay between two redraws of the clock. Default 1s.
-a nsdelay Additional delay between two redraws in nanoseconds. Default 0ns.