the triggered linseg and expseg opcodes have a name inconsistency and slight mismatch in the manual.
The manual describes the two is "triglinseg" and "trigexpseg", which is whas I would expect. Having had errors with those, I ran csound -z and found:
trigLinseg and trigExpseg .
Either one could be changed to match the other, but I'd personally wish the manual to be correct with the all lowercase spelling.