How to install and upgrade package in Ubuntu

Edit

vi /etc/apt/sources.list

deb http://ppa.launchpad.net/chromium-daily/ppa/ubuntu karmic main
deb-src http://ppa.launchpad.net/chromium-daily/ppa/ubuntu karmic main

sudo apt-get update
sudo apt-get install chromium-browser

sudo apt-get upgrade

Make a standalone plot using TikZ

\documentclass{minimal}

\usepackage{tikz}

\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%


\begin{document}

\begin{tikzpicture}[scale=1.6]
    \draw[->] (0,0) -- (4,0) coordinate (x axis);
    \draw[->] (0,0) -- (0,3.5) coordinate (y axis);
  \shadedraw [shading=axis,shading angle=90, left color=blue!70,right color=blue!30, draw=blue!50!black] (0.2,0) rectangle (3.8,3.3);
    \shadedraw [shading=axis,shading angle=90] (0.6,0) rectangle (2.0,2.3);
 
 \node at(0.2,-0.2){{$20$}};
 \node at(0.6,-0.2){{$60$}};
 \node at(2.0, -0.2){{$600$}};
 \node at(3.8, -0.2){{$1400$}};
 \node at(4.5, 0){{$p_{T}$[GeV]}};

 \node at(-0.2, 2.3){{$2.8$}};
 \node at(-0.2, 3.3){{$4.4$}};
 \node at(-0.2, 3.7){{$|y|$}};

 %
 \node at(1.3, 1.3){{$17\,\,nb^{-1}$}};
 \node at(2.9, 2.6){{$40\,\,pb^{-1}$}};
    \end{tikzpicture}

\end{document}

Merge several EPS files to one file

gs -sDEVICE=epswrite     -dNOPAUSE -dBATCH -dSAFER     -sOutputFile=merged.eps   *eps

Merge EPS and convert EPS to PDF

gs -sDEVICE=pdfwrite     -dNOPAUSE -dBATCH -dSAFER     -sOutputFile=merged.pdf  *eps

http://www.linuxjournal.com/content/tech-tip-using-ghostscript-convert-and-combine-files

The best way to concert a bunch of eps file to a combined pdf file is,

1. 
   

   
   for i in `ls *eps`
   do
       ps2pdf -dEPSCrop ${i}
   done
   

   
   


2. 
   

   
   gs -sDEVICE=pdfwrite     -dNOPAUSE -dBATCH -dSAFER     -sOutputFile=merged.pdf  *pdf