\lstset{%
    backgroundcolor=\color{gray!25},
    basicstyle=\ttfamily,
    breaklines=true,
    columns=fullflexible
}

\begin{lstlisting}
tshark -n -r  capture-20170916110006.cap.gz -T fields -e frame.time_epoch  -e ip.src -e tcp.flags
1505552542.807286000 x.45.177.71 0x00000010
1505552547.514922000 x.45.177.71 0x00000010
\end{lstlisting}