I can't remember how to do this (without a file)

I want to "net use s: /d" a drive that may have a file lock (open file)

from the cmd line it prompts: Is it OK to continue disconnecting and force them closed? (Y/N) [N]:

I want to provide it the "y" on the cmd line

If I do this:
net use s: /d <y

It assumes y is a file

Any ideas??
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