How to install/uninstall a program?

A program is installed using

$\framebox{ \texttt{ \textcolor{red}{\bf sudo apt-get install PROGRAMNAME} } }$
and uninstalled with

$\framebox{ \texttt{ \textcolor{red}{\bf apt-get remove PROGRAMNAME} } }$ .
For example, to uninstall emacs

$\framebox{ \texttt{ \textcolor{red}{\bf apt-get remove emacs21} } }$

To uninstall programs installed through unzipping .deb packages, for example the program tovid, use the followyng syntax

$\framebox{ \texttt{ \textcolor{red}{\bf sudo aptitude remove -purge tovid} } }$

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