\begin{knitrout}
\definecolor{shadecolor}{rgb}{0.969, 0.969, 0.969}\color{fgcolor}\begin{kframe}
\begin{alltt}
\hlkwd{system}\hlstd{(}\hlstr{"cat /etc/os-release"}\hlstd{,} \hlkwc{intern} \hlstd{=} \hlnum{TRUE}\hlstd{)}
\end{alltt}
\begin{verbatim}
##  [1] "NAME=\"Ubuntu\""                                     
##  [2] "VERSION=\"16.04.4 LTS (Xenial Xerus)\""              
##  [3] "ID=ubuntu"                                           
##  [4] "ID_LIKE=debian"                                      
##  [5] "PRETTY_NAME=\"Ubuntu 16.04.4 LTS\""                  
##  [6] "VERSION_ID=\"16.04\""                                
##  [7] "HOME_URL=\"http://www.ubuntu.com/\""                 
##  [8] "SUPPORT_URL=\"http://help.ubuntu.com/\""             
##  [9] "BUG_REPORT_URL=\"http://bugs.launchpad.net/ubuntu/\""
## [10] "VERSION_CODENAME=xenial"                             
## [11] "UBUNTU_CODENAME=xenial"
\end{verbatim}
\end{kframe}
\end{knitrout}