LaTeX template for most of my stuff

template.tex

\documentclass[11pt,a4paper]{jarticle}

%%%% settings %%%%
\usepackage{algorithmic}
\usepackage{listings,jlisting}

% lstlisting setting
% number - line number of codes
\lstset{
language={ruby},
frame=tbrl,
basicstyle=\small\ttfamily,
breaklines=true,
numbers=left,
numberstyle=\scriptsize,
stepnumber=1,
numbersep=1zw,
}
\usepackage{amsmath}
\usepackage{fancyhdr}
\usepackage{enumerate}
\usepackage[dvipdfmx]{graphicx}
\usepackage{thmbox}
\usepackage{txfonts}
\usepackage{bm}
\usepackage{url}

\usepackage{tabularx}
\usepackage{longtable}
\usepackage{fancybox}

% for two column layout
% use begin{multicols}{N}
\usepackage[]{multicol}

% begin page margin setting
\usepackage[top=20truemm,bottom=20truemm,left=20truemm,right=20truemm]{geometry}
% end page margin setting
\setlength{\headheight}{16pt}

% in a more stricter fashion
%\setlength{\hoffset}{-5.4mm}
%\setlength{\voffset}{-5.4mm}
%\setlength{\headheight}{17pt}
%\setlength{\topmargin}{0mm}
%\setlength{\oddsidemargin}{0cm}
%\setlength{\textheight}{231.6mm}
%\setlength{\textwidth}{170mm}
%\setlength{\headsep}{12pt}

% fancy header setting
\pagestyle{fancy}
  \lhead{}
  \chead{} % 上部中央
  \rhead{\thepage}
  \cfoot{} % 下部中央
  \rfoot{\thepage}
  \renewcommand{\headrulewidth}{0.4pt}
  \renewcommand{\footrulewidth}{0.4pt}
% end fancy header setting

%%%% end settings %%%%

\title{} % titlepage環境使う場合は不要
\author{} % titlepage環境使う場合は不要
\date{\today} % titlepage環境使う場合は不要

\begin{document}

\maketitle

\end{document}