A silly ASCII clock counting down to zero from the provided number of seconds in a tremendously ugly way.
dune build in the project root should generate an executable file tcd.exe in _build/default/bin/. Place this somewhere in your $PATH or use dune install, which will most likely place the executable as ~/.opam/default/bin/tcd
To use, call tcd with an integer value as the first argument: tcd 61 would count down from 1 minute, 1 second. You can also give larger units of time by separating the arguments by spaces: tcd 2 0 counts down from two minutes and tcd 1 0 10 counts down from 1 hour and 10 seconds.