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We consider in this paper the input-output properties of an atom-nanowire coupling system which is composed of two individual terminated metal nanowaveguides and a two-level optical emitter. In detail, four aspects of the input-output properties are studied. First, we discuss in particular the coherent perfect absorber in the linear excitation regime and give the condition to realize it. Second, the transmittivity of the atom-nanowire system in the nonlinear regime is calculated, and a Rabi-like splitting associated with optical nonlinearity is found. Such a result is much different from the Rabi splitting in the atom-cavity system in the low excitation limit. Third, we find that the cooperation of optical nonlinearity and spatial asymmetry can generate optical nonreciprocity. Finally, a negative differential transmittivity is achieved with appropriate parameters. Our findings show promising applications in the full-optical device. [ABSTRACT FROM AUTHOR]