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+---
+langauge: roff
+contributors:
+    - ["Jeff Parent", "https://github.com/jecxjo"]
+filename: learnroff.ms
+lang: en-us
+---
+
+```groff
+.\" All comments start with a \"
+.\" There are no multi-line comments. Comments can be inserted at the end of
+.\" any line.
+
+.\" roff is NOT a "What You See Is What You Get" word processing software like
+.\" MS Word, or OpenOffice Writer.
+
+.\" Every roff command starts with a new line and a period (.) or a single
+.\" quote ('). Any line that doesn't start with a period or quote is considered
+.\" normal text.
+
+.\" roff documents start by deciding which macro package to use. There are
+.\" many, all designed for different purposes and different types of documents.
+.\" The most common one is the man macro package which most manpages are
+.\" created from.
+
+.\" The ms package is designed for creating for general purpose documents like
+.\" papers, letters and books. It is the default package for groff. The me
+.\" package is designed for creating technical documents. See `man 1 groff_me`
+.\" or `man 1 groff_ms` for more details.
+
+.\" To build this document into a pdf use the following command:
+.\" groff -p -e -t -ms -Tpdf learnroff.ms > learnroff.pdf
+
+.TL \" Sets the title of the document
+LearnXinYMinutes - roff Edition
+
+.AU \" Sets the author
+Jeff Parent
+
+.AI \" Sets the author's institution
+ACME Corp
+
+.AB \" Begins the abstract
+roff is a typesetting system used to create documents using plain text and
+outputting PDF, HTML, DVI and other formats with a simple Unix tool. It
+supports basic typesettings as well as advanced features like tables, graphs
+and equations.
+.AE \" Ends the abstract
+
+.tp  \" Triggers the title page
+
+.NH 1 \" Triggers a heading, level 1 (e.g 1. Introduction)
+Introduction
+.LP \" Starts a new paragraph
+Welcome to the wonderful typesetting world of roff.
+
+.NH 1
+A section
+.LP
+This is a section. Sections are used to divide a document into smaller parts.
+
+.NH 2 \" Triggers a heading, level 2 (e.g. 1.1 Subsection)
+A subsection
+.LP
+This is a subsection. There can be many subsections with varying levels of
+depth.
+
+.NH 2
+Another subsection
+.LP
+More text can go here.
+
+.NH S 2 9 2 
+Some sections may need an explicit section number
+.LP
+However most cases you can rely on the automatic numbering. There is also
+support for number/letter combinations.
+
+.NH 1
+Some notes about text
+.LP
+roff does a good job handling text. It will automatically wrap text if the line
+gets too long and will also handle text
+that has newlines
+in it. If you
+.br
+needs
+.br
+to
+.br
+break
+.br
+you add a .br command to the source code.
+
+.LP
+Separate paragraphs by the .LP command. This will add a blank line and start
+the text on the left most margin.
+
+.PP
+Using the .PP command a paragraph is started by indenting the first line. All
+additional lines will be at the left most margin.
+
+.QP
+The .QP command is used to start a paragraph where all lines are indented on
+both the left and right sides of the document. This is a good way to quote text
+or specify some sort of significance to the text.
+
+.XP
+The opposite of .PP is the .XP macro. As you can see this paragraph indents all
+lines except for the first one. This is knowing as an \*Qextended\*Q paragraph
+or a hanging indent.
+
+.sp 4 \" Adds 4 lines of space
+Sometimes you need to add more space. That is what the .sp command is for.
+
+.NH 1
+Typography
+.LP
+
+roff supports many of the common typographic features all typesetting software
+does. You can
+.B bold
+a word, or you can
+.I italicize
+a word. You can also
+.BI "bold italicize"
+a phrase or use
+.CW "Common Width"
+for showing commands. There is support for Super and Sub scripting as well and
+it looks like this\*[{]Super Script\*[}] and this\*[<]Sub Script\*[>].
+Unfortunately some typesetting is done with commands and others through escaped
+characters.
+.LP
+Each set of macros has their own ways of handling typesetting features, roff
+has a lot of low level commands so check out the documentation for more info.
+The convention is that lowercase commands are low level built in operations
+while uppercase commands are from the macro package.
+
+.NH 1
+Lists
+.LP
+Lists are easy to implement in roff. There are two types of lists, bulleted and
+numeric.
+
+.IP \[bu] 3 \" the \[bu] is a bullet character
+Item 1
+.IP \[bu] 3
+Item 2
+.RS \" Starts a new list inside a list
+.IP \[bu] 3
+Sub Item 1
+.RE
+.IP \[bu] 3
+Item 3
+.LP
+
+.\" We can auto numerate the list or manually set the values
+.nr step 0 1 \" Setting the step counter to 0, incrementing by 1
+
+.IP \n+[step] 3 \" Increment the step counter by 1 and set the indentation to 3
+Apple.
+.IP \n+[step] 3
+Bananna
+.IP \n+[step] 3
+Cherry
+.IP "Words Not Numbers" 3
+This is a list item without a number
+.LP \" End of list, starting new paragraph
+
+.NH 1
+Math
+.LP
+roff was created for typesetting memos and technical documents. It was created
+at Bell Labs as a word processor for all the technical stuff they were doing.
+As such, we need to be able to add special symbols to our paper!
+.LP
+Math is often a big part of writing technical documents. roff has support for
+this both as inline characters as well as equation figures. Unlike other
+typesetting software, roff relies on independent preprocessors to handle things
+like Math Equations. The .EQ macro starts an equation section and the .EN macro
+ends it. See
+.CW "man 1 eqn"
+for details on how to use the eqn preprocessor.
+.EQ
+a sup 2 + b sup 2 = c sup 2
+.EN
+.LP
+Greek letter can be written inline such as \(*x, \(*b, \(*g and \(*s. Within an
+equation you can use these symbols as well.
+.EQ
+Area^of^a^Circle = pi r sup 2
+.EN
+Operators are an essential part of a mathematical document. Let's write an
+equation to see how that is done:
+.EQ
+cos { 2 theta } = cos sup 2 { theta } - sin sup 2 { theta }
+.EN
+Fractions (Numerator-Denominators) can be written in this form:
+.EQ
+10 over 7
+.EN
+Summation and Integrals are written with the sum and int commands:
+.EQ
+sum from {i = 0} to 5 {f(i)}
+.EN
+.EQ
+int from 0 to inf { e sup { -x } d x }
+.EN
+
+.NH 1
+Tables
+.LP 
+
+Tables are created using the 
+.CW tbl
+preprocessor. To include a table use the .TS and .TE macros.
+
+.TS
+center box;
+c | c | c
+l | n | r.
+Name	Age	Location
+_
+John Doe	30	New York
+Jane Smith	25	Los Angeles
+Sam Brown	40	Chicago
+.TE
+
+.NH 1
+Diagrams
+.LP
+
+Diagrams are also supported, using the
+.CW pic
+preprocessor. To include a block diagram use the .PS and .PE macros.
+
+.PS
+box "Starting";
+arrow;
+circle "B1";
+arrow;
+ellipse "End";
+.PE
+
+.LP
+There is also the ability to generate a graph.
+
+.PS
+pi = atan2(0, -1);
+for i = 0 to 2 * pi by 0.1 do {
+  "-" at (i/2, 0);
+  "." at (i/2, sin(i)/2);
+  ":" at (i/2, cos(i)/2);
+}
+.PE
+
+.NH 1
+Other Preprocessors
+.LP
+There are a few other preprocessors available to roff.
+.CW chem
+is used to create chemical structure diagrams.
+.CW grn
+is used for creating pictures.
+.CW refer
+is used for creating bibliographies.
+```
+
+## More on roff
+
+* [The GNU Troff Manual](https://www.gnu.org/software/groff/manual/groff.html)
+* [A Guide to Typesetting Mathematics using GNU eqn](https://lists.gnu.org/archive/html/groff/2013-10/pdfTyBN2VWR1c.pdf)
+* [Making Pictures with GNU PIC](https://pikchr.org/home/uv/gpic.pdf)
+* [man groff_me](https://linux.die.net/man/7/groff_me)
+* [man groff_ms](https://linux.die.net/man/7/groff_ms)