Postpone (action)

This subcommand postpones a task, by advancing the due date a certain period ahead (and if applicable, the start date as well).

Synopsis:

todo.sh postpone [-s] TASK# <period>

where period is a number followed by d, w, m or y (days, weeks, months, years respectively).

With the -s flag, the start date of the task will also be shifted along with the due date.

When the task is overdue, today's date will be used as an offset for postponing a task instead.