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You could try something like:
while : ; do
sleep 5
echo "Still running at $( date )"
done &
pid=$!

<YOUR CODE HERE>

kill $pid

...this is an issue with shell quoting.

In my original reply which mistakenly used double quotes, the "$?" was returning the exit code of whatever command was run prior, not of the rsh (the "$?"...

This should work:
rsh sundev1 "psef bb_filexfer; echo $?"