Section and Subsection Heading Style [duplicate]

Question

Possible Duplicate:
Formatting section titles

How can I change the format of section, subsection and ... to something like below?

2.1 | Greenhouse Effect

Answer 1

The default formatting of section heading counters is performed by the macro \@seccntformat, which is defined in latex.ltx as

\def\@seccntformat#1{\csname the#1\endcsname\quad}

This prints the counter and inserts \quad. You can adapt this to print the counter and insert something else, like

\def\@seccntformat#1{\csname the#1\endcsname\hspace*{0.5em}$|$\hspace*{0.5em}}

This would still have a \quad-like feel, only with the insertion of a pipe:

\documentclass{article}
\usepackage{lipsum}% http://ctan.org/pkg/lipsum
\makeatletter
% \def\@seccntformat#1{\csname the#1\endcsname\quad}% Default
\def\@seccntformat#1{\csname the#1\endcsname\hspace*{0.5em}$|$\hspace*{0.5em}}
\makeatother
\begin{document}
\section{Greenhouse effect}
\lipsum
\end{document}

Of course, this would hold far all section from the level of \section downward, whenever you have a numbered heading. Unnumbered headings will not be affected.

Answer 2

You can use the titlesec to help with this; I've used the lipsum package for sample text and I found \textpipe from the tipa package from The comprehensive sysmbols list.

\documentclass{article}

\usepackage{titlesec}
\usepackage{lipsum}
\usepackage{tipa}

% custom section
\titleformat{\section}
{\normalfont\Large\bfseries}
{\thesection\hskip 9pt\textpipe\hskip 9pt}
{0pt}
{}

\begin{document}

\section{Greenhouse effect}
\lipsum[1]

\end{document}