Including all files within a directory [duplicate]

Question

Possible Duplicate:
How to iterate through the name of files in a folder

Using \input{filename}, I can input a file canned "filename.tex". I have a directory containing all of the files I want to include. How can I create a for loop, which inputs all of those files?

• The contents of the directory sometimes changes (so I do not want to manually specify all of the files).
• The files are numbered (e.g. file01.tex, file02.tex), so the loop should have no difficulty inputing them in the correct order.
• Other code will be placed within the for loop (before and after the input command), so I do not want to simply list all of the files at once (e.g. \input{file01,file02}).

Answer 1

You can use a \foreach loop:

\documentclass{article}
\usepackage{pgffor}
\usepackage{filecontents}% Used so that the external files can be placed in this file

\begin{filecontents}{file01.tex}
  \section{File 01}
\end{filecontents}

\begin{filecontents}{file02.tex}
  \section{File 02}
\end{filecontents}

\begin{document}

\foreach \i in {00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, ...,19} {%
    \edef\FileName{file\i}%     The % here are necessary to eliminate any
    \IfFileExists{\FileName}{%  spurious spaces that may get inserted
       \input{\FileName}%       at these points
    }
}

\end{document}

Note that I added % to places where TeX would have inserted a spurious space. See for Tex Capacity Exceeded (if remove % after use of macro) as to the dangers of leaving those out.