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I've often heard that pipes create a new instance of cmd..

I don't see it though

If I go to e.g. the windows directory and I do dir /p | more, then I don't see a new cmd.exe instance appear in task manager.

i'm also interested in when that has ramifications that some might not foresee.

thanks

The new instance is most likely alredy terminated before the Task Manager updated the list. You will need blocking commands. E.g.

Steffen

it seems to create two command processes



seems to be creating two cmd processes

So if I open a cmd.exe window, I have one showing in task manager

then I run that and I get 3 running. So it created two.

why?

I notice that pause or pause>nul, doesn't create a cmd process. So it seems like the pipe to set /p=asdf creates two.

That's what Process Explorer shows:

Steffen

thanks

You should read the Q&A at http://stackoverflow.com/q/8192318/1012053.

There are lots of consequences discussed there.


Dave Benham