On Thu, Feb 11, 2021 at 10:15 AM M Douglas McIlroy <m.douglas.mcilroy@xxxxxxxxxxxxx> wrote: > Many thanks for so thoroughly exploring my query. You are very welcome. > I have long lived with the limitations of invoking Windows apps from > Cygwin. Fortuitously I could work around them without resorting to > "command prompt", though clearly that isn't always possible. And you > have shed light on the difficulty of the opposite: invoking Cygwin > apps from Windows. Were you able to resolve the situation (for instance, by staying entirely within the Cygwin ecosystem for `git` and `ed`)?