How insert a character at the begin of every line from a source code?

Question

I'm writing a lecture with many source codes for example. The codes are stored in severus different files. I use listing and minted packages for formatting the sources.

I would like add character at the begin of every line of some codes like:

• Bash shell ($ or #)
• Python shell (>>>)
• Matlab (>>)
• Other shells (>)

I tried some solutions which have given on:

• Environment prints same character at beginning of each output line
• how to put “>” before lines?

But both solutions have the same problem when I try:

\begin{foo_environment} 
    \input{bar.txt} 
\end{foo_environment}

In both solutions the linebreaking are ingnored

I have tried executing a bash command:

sed 's/^/$ /' bar.sh > bar.txt

This works locally but I can't do the same in Overleaf and Sharelatex

This is a sample code bar.sh:

cd ..
mount /dev/sda3 /mnt/
cd ~/.ssh/
ll
cd ~
ls -al

The result must be:

$ cd ..
$ mount /dev/sda3 /mnt/
$ cd ~/.ssh/
$ ll
$ cd ~
$ ls -al

Answer 1

With listings you can redefine the numberstyle:

\documentclass{article}
\usepackage{listings}

\lstset{
  language=tex,
  basicstyle=\footnotesize\ttfamily\selectfont,
  keepspaces=true,
  numbers=left,
  numbersep=5pt,
  numberstyle=\numberwithprompt,
}

\newcommand{\lstprompt}{>>>}
\newcommand\numberwithprompt[1]{\footnotesize\ttfamily\selectfont#1 \lstprompt}


\begin{document}
\begin{lstlisting}
a
b
c
\end{lstlisting}
\end{document}

Answer 2

minted.sty uses fancyvrb.sty to typeset the minted environments. fancyvrb.sty provides a macro named \FancyVerbFormatLine to change individual line formatting. You can define your own macro for your environment and plug it into minted with the formatcom key. Code:

\documentclass{article}

\usepackage{minted}

\newcommand{\BashFancyFormatLine}{%
  \def\FancyVerbFormatLine##1{\$\,##1}%
}

\begin{document}

\noindent Some Text
\begin{minted}[formatcom=\BashFancyFormatLine]{bash}
cd ..
mount /dev/sda3 /mnt/
cd ~/.ssh/
ll
cd ~
ls -al
\end{minted}
some text

\end{document}

---

You can apply the same procedure to external files by using \inputminted:

\documentclass{article}

\usepackage{minted,filecontents}

\begin{filecontents*}{bash.sh}
cd ..
mount /dev/sda3 /mnt/
cd ~/.ssh/
ll
cd ~
ls -al
\end{filecontents*}

\newcommand{\BashFancyFormatLine}{%
  \def\FancyVerbFormatLine##1{\$\,##1}%
}

\begin{document}

\noindent Now read the same code from a file:
\inputminted[formatcom=\BashFancyFormatLine]{bash}{bash.sh}

\end{document}

Answer 3

With listings you can hook into the line numbering code. This approach is fine if you don't put \labels in your code -- I never have and didn't even know you could -- but if you do, when you refer to the line numbers they will be followed by whatever prompt text you define. In that case see Ulrike Fischer's answer.

Here's an example, which defines a "prompt" (\lstprompt) as ">>>" (python style) in line 13 and applies it in line 14.

\documentclass{article}
\usepackage{listings}

\lstset{ 
  language=tex,
  basicstyle=\footnotesize\ttfamily\selectfont,
  keepspaces=true,                 
  numbers=left,                    
  numbersep=5pt,                   
  numberstyle=\footnotesize\ttfamily\selectfont\,
} 

\newcommand{\lstprompt}{>>>}
\renewcommand*\thelstnumber{{\the\value{lstnumber}}\lstprompt}
\begin{document}
    \lstinputlisting{lst_test.tex}
\end{document}

And the output (using the code above as a test case):

Of course you can insert spaces or otherwise tweak at will. Here's a $ sign with no numbering:

\newcommand{\lstprompt}{\$}
\renewcommand*\thelstnumber{\lstprompt}