# Redefining the section command, keeping the starred definition

Currently, I'm working with a document based on the standard book.cls. I redefined the section command (unstarred) to get a more fancy heading. But while doing this, I ran into some walls.

\renewcommand{\section}{\secdef\@section\@ssection}
\newcommand{\@section}[2][?]{...}


Well obviously, I've redefined the unstarred version with \@section, and together with \secdef I fixed bugs in the ToC (strange doublings) and tried to keep the definition of the starred version. To make it short, it doesn't work... here is the output:

! Undefined control sequence.
\reserved@a *->\@ssection


Does anybody know how to handle it? Even \let doesn't help here...

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Sectioning command below \chapter (\section, \subsection, ...) do not have a separate "starred" version, like you propose \@ssection. You have to define that manually, like is done for \chapter and \part. – Werner Oct 16 '12 at 18:01
Would you be able to provide a complete, minimal working example (MWE) that shows what you've done in its entirety? – Werner Oct 16 '12 at 18:04

\section is not defined via \secdef. So there is no \@ssection.

This may work:

\makeatletter
\let\latex@section\section
\def\section{\secdef\my@section{\latex@section*}}

\def\my@section[#1]#2{...}

\makeatother


So \section* will call \latex@section*, while \section{title} will call

\my@section[title]{title}


while \section[x]{title} will call

\my@section[x]{title}

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