\usepackage{listings}%
\usepackage{courier}%

\newcommand{\lstsetc}
{\lstset
{
language=[ANSI]C,
numbers=left,
tabsize=4,
frame=single,
basicstyle=\ttfamily\small,
commentstyle=\color{green},
keywordstyle=\color{blue}\textbf
}
}

\newcommand{\lstsetmake}
{\lstset
{
language=make,
numbers=left,
tabsize=4,
frame=single,
basicstyle=\ttfamily\small,
commentstyle=\color{green},
keywordstyle=\color{blue}\textbf
}
}

\newcommand{\lstsetbash}
{\lstset
{
language=bash,
numbers=left,
tabsize=4,
frame=single,
basicstyle=\ttfamily\small,
commentstyle=\color{green},
keywordstyle=\color{blue}\textbf
}
}

\lstloadlanguages{[ISO]C++, [ANSI]C, bash, make, sh, Gnuplot}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% example usage:
%
% \input{config/sourcelst.tex}
% ...
% \lstsetc
% \begin{lstlisting}
% #include <stdio.h>
%
% int main(int argc, char *argv[])
% {
%        printf("Hello World!\n");
%        return 0;
% }
% \end{lstlisting}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%