Mein LaTeX-Forum

   keywordstyle=\bfseries\color{green},
   commentstyle=\itshape\color{purple},
   identifierstyle=\color{blue},
   stringstyle=\color{orange}
 

guest@guest <FOLDER>]$ sudo apt install inxi -y && inxi -b

\documentclass{article}
\usepackage{listings,xcolor}

\lstset{
  keywordstyle=\bfseries\color{green},
  commentstyle=\itshape\color{purple},
  identifierstyle=\color{blue},
  stringstyle=\color{orange}
}

\begin{document}

\begin{lstlisting}[language={[LaTeX]TeX}]
\lstset{
  keywordstyle=\bfseries\color{green},
  commentstyle=\itshape\color{purple},
  identifierstyle=\color{blue},
  stringstyle=\color{orange}
}  
\end{lstlisting}

\end{document}

\documentclass{article}
\usepackage{xcolor}
\begin{document}
\color{blabla}
\end{document}

! Package xcolor Error: Undefined color `blabla'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                 
l.4 \color{blabla}