The first execution probably yields the usage.
% htodo
usage
htodo add: add a task
htodo: pick a task
There is a way to add a task.
% htodo add
a task to: drink cofee
Then htodo tells you what to do.
% htodo
drink cofee
d: done
n: never doing
w: waiting for another task
Here, you remember you have to get cofee.
> w
1: drink cofee
n: a new task
after which task?
> n
a task to: get cofee
Next, you ask htodo what to do.
% htodo
get cofee
d: done
n: never doing
w: waiting for another task
The system tells you to get cofee, so you do it.
> d
Again, you ask the system what to do.
% htodo
drink cofee
d: done
n: never doing
w: waiting for another task
Now you drink the cofee.
> d