LInux utility

1. For closing a freezed program

Press ALT+F2 then run xkill command . Then a cross will appear at mouse cursor . Place this cursor to freezed program tab .

2. For deleting files of a specific type

find . -name "*.o" -type f -delete

Getting started with latex in ubuntu simple

1. apt-get install texlive (for ubuntu)
2.  

   \documentclass[a4paper,12pt]{article}
   \begin{document}
   
   The foundations of the rigorous study of \emph{analysis}
   were laid in the nineteenth century, notably by the
   mathematicians Cauchy and Weierstrass. Central to the
   study of this subject are the formal definitions of
   \emph{limits} and \emph{continuity}.
   
   Let $D$ be a subset of $\bf R$ and let
   $f \colon D \to \mathbf{R}$ be a real-valued function on
   $D$. The function $f$ is said to be \emph{continuous} on
   $D$ if, for all $\epsilon > 0$ and for all $x \in D$,
   there exists some $\delta > 0$ (which may depend on $x$)
   such that if $y \in D$ satisfies
   \[ |y - x| < \delta \]
   then
   \[ |f(y) - f(x)| < \epsilon. \]
   
   One may readily verify that if $f$ and $g$ are continuous
   functions on $D$ then the functions $f+g$, $f-g$ and
   $f.g$ are continuous. If in addition $g$ is everywhere
   non-zero then $f/g$ is continuous.
   
   \end{document}

   Save this content to test.tex named file . 

   3.latex test.tex (for compiling)

   4.xdvi test.dvi & (for seeing output)

   5.pdflatex test.tex  (for generating output)

   6.htlatex text.tex (for getting output in html file)

   To install htlatex in ubuntu type (sudo apt install tex4ht 

   source

   http://www.maths.tcd.ie/~dwilkins/LaTeXPrimer/