How to set page number at right footer

Question

I want to know how can i set the page number of documents at right footer i.e. bottom right of the page in the whole document even on the chapter heading page too. Please help me out on this.

Answer 1

This should get you started.

\documentclass{article}

\usepackage{fancyhdr}
\usepackage{lipsum}

\title{Some document}
\author{Shivam Dhoot}

% Turn on the style
\pagestyle{fancy}
% Clear the header and footer
\fancyhead{}
\fancyfoot{}
% Set the right side of the footer to be the page number
\fancyfoot[R]{\thepage}

\begin{document}
\maketitle
% Input some blind text
\lipsum
\end{document}

Since you explicitly mention that you want the page number also on the footer of chapter heading pages, you need to redefine the plain style, which is used for these pages. Copying from this answer here I get this code here, which seems to be exactly what you want.

\documentclass{report} % to have chapters

\usepackage{fancyhdr} % to change header and footers
\usepackage{blindtext} % to quickly get a full document

\title{Some document}
\author{Shivam Dhoot}

\pagestyle{fancy} % Turn on the style
\fancyhf{} % Start with clearing everything in the header and footer
% Set the right side of the footer to be the page number
\fancyfoot[R]{\thepage}

% Redefine plain style, which is used for titlepage and chapter beginnings
% From https://tex.stackexchange.com/a/30230/828
\fancypagestyle{plain}{%
    \renewcommand{\headrulewidth}{0pt}%
    \fancyhf{}%
    \fancyfoot[R]{\thepage}%
}

\begin{document}
\maketitle

% Input some blind text
\blinddocument
\end{document}

Let us know if that helps or if you need more.

Answer 2

I use \usepackage{fancyhdr} and commands like you wrote. However, a horizontal line appears at the top of the page.

The packages are like below:

\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{textcomp}
\usepackage[portuguese]{babel}
\usepackage{amsmath}
\usepackage{mathtools}
\usepackage{subeqnarray}
\usepackage{amssymb}
\usepackage{amsfonts}
\usepackage{graphicx}
\usepackage{multirow}
\usepackage{booktabs}
\usepackage{xcolor}
\usepackage{enumerate}
\usepackage{enumitem}
\usepackage{lscape}
\usepackage{lipsum}
%=================== pagina
\usepackage{fancyhdr}
\usepackage{lipsum}
% Turn on the style
\pagestyle{fancy}
% Clear the header and footer
\fancyhead{}
\fancyfoot{}
% Set the right side of the footer to be the page number
\fancyfoot[R]{\thepage}

The result are like:

How can I remove this horizontal line at the top?

Thank you. Erick.