# Number every line of pages

When editing documents it is convenient to have all the lines on a page numbered (on the left margin) so that the reviewer can refer to them in his report. How can I achieve this with LaTeX?

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This questions seems to be a duplicate of How to number all lines in a draft?, which didn't got answered. However, it links to How to add paragraph line number in right margin which seems to doing it. Basically use the lineno package. However, it might skip some lines. Edit: See also Lineno - numbering abstract's lines. –  Martin Scharrer Apr 17 '11 at 16:42
@Martin Scharrer I saw the article, but I am interested in numbering all the lines, i.e. not just the paragraph. –  Yiannis Lazarides Apr 17 '11 at 16:50

A slightly different approach to that of the faq pointed out by Lockstep.

Firsty, we need to build a box 3em wide to hold the numbers of all the lines. This box will be later positioned at the left margin and unboxed.

 \newsavebox{\@linebox}
\savebox{\@linebox}[3em][t]{\parbox[t]{3em}{%
\@tempcnta\@ne\relax
\loop{\underline{\scriptsize\the\@tempcnta}}\\


We use Knuth's loop to generate the line numbers. We can position the box and typeset the line numbers by using thr \put command from the LaTeX's picture environment (although TikZ afficionados can use TikZ). As we need this box on every page, we use the fancyhdr package to achieve this, rather than messing with the output routines. Other possibilities is the background package etc.

\fancyhead[LO]{%
\begin{picture}(0,0)%
\put(-18,-25){\usebox{\@linebox}}%
\end{picture}}


You should place the whole code within a conditional to switch between draft and final mode, depending on your class. The full minimal is shown below.

\documentclass[10pt]{article}
\usepackage{fancyhdr,lipsum}
\makeatletter

\newsavebox{\@linebox}
\savebox{\@linebox}[3em][t]{\parbox[t]{3em}{%
\@tempcnta\@ne\relax
\loop{\underline{\scriptsize\the\@tempcnta}}\\

\pagestyle{fancy}
\fancyfoot{}
%% insert this block within a conditional
\put(-26,-25){\usebox{\@linebox}}%
\end{picture}}

\begin{picture}(0,0)%
\put(-18,-25){\usebox{\@linebox}}%
\end{picture}}
\fancyfoot[C]{\scriptsize Draft copy}
%% end conditional
\makeatother
\begin{document}
\section*{Lorem Ipsum}
\lipsum
\end{document}

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As Martin Scharrer has pointed out -- and to answer the general question once and for all --: Use the lineno package. (The package allows to number every line, as shown in its documentation.) See this entry of the UK TeX FAQ for possible pitfalls and alternatives.

The following addition to the tex file will cause line numbers to appear (at least in scrbook class using xelatex)

\usepackage{lineno}
\linenumbers

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+1 for the TeX FAQ link. –  Martin Scharrer Apr 17 '11 at 16:57
@Martin: I was hesitant to answer at all, but the existing questions tagged with {line-numbering} weren't general. So I decided that the FAQ link would add some value to my answer. –  lockstep Apr 17 '11 at 16:59