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Thanks for the insights.

I do find the behaviour borderline nuts presuming different rules for coercing variables.

An arguably valid definition I can think of as an alternate is that "$$" is...

Then how would the following ever work:
xxx=$(date)
( sleep 5
xxx=$(date)
echo $xxx
) &
echo $xxx

if $xxx were coerced when the (...)& is being scanned, then the two echo statements...

When you move the ftp section into the "if" do you have any indenting? <<- will strip leading tabs only, not spaces. Better to have EOF always at the left edge.

This is not the same as a few of the other posted items dealing with sub-process pids (that I saw anyway).

If zot contains:

echo "main mypid: $$ - lastpid: $!"
(
echo "block mypid: $$ -...