# How to hide number of every chapter?

I want to hide the number of every chapter in my thesis when I use command \chapter. But the thing is when I put * such that \chapter*, the subsection will be start from 0.1. So, I want to hide the number at front of word chapter but still the number at section below start with 1.1 and so on. here my latex command;

\documentclass[12pt]{thesis}
\usepackage{amssymb,amsmath,latexsym}
\usepackage[top=2cm, bottom=2.5cm, footskip=1.2cm, left=4cm, right=2.2cm]{geometry}
\usepackage{setspace}
\usepackage{fancyhdr}
\pagestyle{fancyplain}
\fancyhf{}
\cfoot{\thepage}%set page numbering at bottom

\begin{document}

\chapter{chapter 1}

I want hide the number at front of word chapter but still the number at section below start with 1

\section{bab 1}

blah

\chapter{ chapter 2}

\section{sub chapter 2}

\end{document}


here the output:

• Just to be sure, you don't want to write \chapter{CHAPTER 1} in your real rocument, right? – Johannes_B Dec 18 '16 at 7:33
• Where can e find thesis.cls? I have a lot of experience with various thesis.cls and Thesis.cls, none of which was a good one. – Johannes_B Dec 18 '16 at 7:34
• Does the class load pacage titlesec? If not, load it by yourself and use titleformat in your preamble. A similar question was asked yesterday, but in german. – Johannes_B Dec 18 '16 at 7:35
• Before i forget it, welcome to TeX.SX :-) – Johannes_B Dec 18 '16 at 7:35

My suggestion would be to make \chapter be like \chapter* with the addition of some counter and ToC updating. To do this, add

\let\oldchapter\chapter% Store \chapter in \oldchapter
\renewcommand{\chapter}[1]{% Update \chapter
\cleardoublepage
\refstepcounter{chapter}% Step chapter counter
\oldchapter*{#1}% Regular \chapter*
\chaptermark{#1}% Set chapter mark (typically for header)