In PS double-quoted strings, backslash does NOT escape '$'.
Only backtick does ('`$'). The previous '\' was being
expanded as a PS variable (undefined), triggering StrictMode error:
'Cannot retrieve variable \ because it has not been set.'
Replace '\$' with '`$' so the literal shell variable reference
\ is emitted correctly to the SSH command.
Simone
db1530cf0f