how to automate scp transfers?

[Xn Nooby]

I need to automate some scp file transfers between a PXE-booted client and
it's Server.  Apparently, I cannot automatically supply the Server account's
password as an argument.  Since the PXE-based machine is coming from a
generated image, I do not reaaly have access to it in order to run
ssh-keygen.  I don't know a lot about SSH or private/public keys, that why I
was hoping to supply the password as a command-line argument to scp.  This
is in a fairly secure environment, but we are trying to use scp instead of
something that needs another server (like ftp).  Any suggestions on how to
automate scp file-transfers?
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