[openssh] What env variables does scp set on remote?

From: Harry Putnam (reader@newsguy.com)
Date: 07/15/02 

From: Harry Putnam <reader@newsguy.com>
Date: Sun, 14 Jul 2002 15:09:06 -0700

When ssh connects to a remote machine it sets a handy variable, SSH_TTY.
Tests against that variable can be used to control things in init
files that need to act different when its ssh as against a console
login.

In home experiements it appears that scp does not set that var, and
therefore it cannot be used to control stuff that might not be good
in a scp connection, so cutting to the chase, I wondered what env
variables if any scp sets on connection, that might be available for
the same kind of usage?

scp -vv [...]
doesn't appear to supply that information.
ditto man scp|grep env

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