Display a 24-hour digital clock with the hour, minute and second fields that updates every second

Display the time in analog or digital form.
More information: <https://manned.org/xclock>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

xclock -digital -strftime '%H:%M:%S' -update 1

click the source code to copy install xclock on any operating system with command-not-found.com