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Feb 2009 -- Due to time pressures, the ongoing development of 'rope' has been suspended temporarily.

ROPE Reference Manual - "not"

The "not" action takes a value from the stack and returns 1 if the value was false (zero or empty string) and 0 if it was true (non-zero or not-empty string).

For example..

$tcp_source 80 eq not assert

Actually, the above example is equivalent to..

tcp_source 80 ne assert