emacs.d/clones/lisp/llthw.common-lisp.dev/1-01-08-configuration.html

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<li class="header">LEARN LISP THE HARD WAY</li>
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Second Draft (in-progress)
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CHANGELOG
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TODO
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<li class="header">PREFACE</li>
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TANSTAAFL
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The Hard Way is Easier
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Who Is This Book For?
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Lisp: A Future History
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Acknowledgements
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<li class="header">PART ONE</li>
<li class="chapter " data-level="3.1" data-path="1-0-0-overview.html">
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Grokking Lisp
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<li class="chapter " data-level="3.1.1" data-path="1-01-00-lisp-bootcamp.html">
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Common Lisp Bootcamp
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Syntax Overview in 5 Minutes
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<li class="chapter " data-level="3.1.1.2" data-path="1-01-02-repl.html">
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The REPL
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Expressions, Parentheses, and Return Values
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Lists, Cons-Cells, and Memory
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Symbols and Namespaces
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Prefix Notation
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Common Lisp Style Guide
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<li class="chapter active" data-level="3.1.1.8" data-path="1-01-08-configuration.html">
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Configuring Your Development Environment
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Printing, Streams, and Strings
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Strings
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<li class="chapter " data-level="3.1.2.2" data-path="1-02-02-more-strings.html">
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More Strings
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<li class="chapter " data-level="3.1.2.3" data-path="1-02-03-unicode.html">
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Unicode and Strings
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<li class="chapter " data-level="3.1.2.4" data-path="1-02-04-chars.html">
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Characters
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<li class="chapter " data-level="3.1.2.5" data-path="1-02-05-more-chars.html">
<a href="1-02-05-more-chars.html">
More Characters
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<li class="chapter " data-level="3.1.2.6" data-path="1-02-06-char-codes.html">
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Character Codes
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<li class="chapter " data-level="3.1.2.7" data-path="1-02-07-strings-from-chars.html">
<a href="1-02-07-strings-from-chars.html">
Strings from Chars
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<li class="chapter " data-level="3.1.2.8" data-path="1-02-08-printing.html">
<a href="1-02-08-printing.html">
Printing
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<li class="chapter " data-level="3.1.2.9" data-path="1-02-09-more-printing.html">
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More Printing
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<li class="chapter " data-level="3.1.2.10" data-path="1-02-10-prin1.html">
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Printing With prin1
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<li class="chapter " data-level="3.1.2.11" data-path="1-02-11-princ.html">
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Printing With princ
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<li class="chapter " data-level="3.1.2.12" data-path="1-02-12-format.html">
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A Brief Introduction to Format
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<li class="chapter " data-level="3.1.2.13" data-path="1-02-13-more-format.html">
<a href="1-02-13-more-format.html">
A Little Bit More on Format
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</li>
<li class="chapter " data-level="3.1.2.14" data-path="1-02-14-pathnames.html">
<a href="1-02-14-pathnames.html">
Pathnames
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<li class="chapter " data-level="3.1.2.15" data-path="1-02-15-streams.html">
<a href="1-02-15-streams.html">
Streams
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</li>
<li class="chapter " data-level="3.1.2.16" data-path="1-02-16-file-streams.html">
<a href="1-02-16-file-streams.html">
File Streams
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<li class="chapter " data-level="3.1.2.17" data-path="1-02-17-binary-streams.html">
<a href="1-02-17-binary-streams.html">
Binary Streams
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<li class="chapter " data-level="3.1.2.18" data-path="1-02-18-prompting-users.html">
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Prompting Users
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<li class="chapter " data-level="3.1.2.19" data-path="1-02-19-pretty-printing.html">
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Pretty-Printing
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<li class="chapter " data-level="3.1.3" data-path="1-03-0-getting-input-from-users.html">
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Extra Credit: Getting Input from Users
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</li>
<li class="chapter " data-level="3.1.4" data-path="1-04-0-lists.html">
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Lists and List-Operations
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<li class="chapter " data-level="3.1.5" data-path="1-05-0-lookups-trees.html">
<a href="1-05-0-lookups-trees.html">
Extra Credit: Look-up Lists and Trees
</a>
</li>
<li class="chapter " data-level="3.1.6" data-path="1-06-0-math.html">
<a href="1-06-0-math.html">
Numbers and Math
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<li class="chapter " data-level="3.1.6.1" data-path="1-06-01-integers.html">
<a href="1-06-01-integers.html">
Integers
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<li class="chapter " data-level="3.1.6.2" data-path="1-06-02-more-integers.html">
<a href="1-06-02-more-integers.html">
More Integers
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<li class="chapter " data-level="3.1.6.3" data-path="1-06-03-hexadecimal-notation.html">
<a href="1-06-03-hexadecimal-notation.html">
Hexadecimal Integer Notation
</a>
</li>
<li class="chapter " data-level="3.1.6.4" data-path="1-06-04-octal-notation.html">
<a href="1-06-04-octal-notation.html">
Octal Integer Notation
</a>
</li>
<li class="chapter " data-level="3.1.6.5" data-path="1-06-05-binary-notation.html">
<a href="1-06-05-binary-notation.html">
Binary Integer Notation
</a>
</li>
<li class="chapter " data-level="3.1.6.6" data-path="1-06-06-ratios.html">
<a href="1-06-06-ratios.html">
Ratios and Rational Numbers
</a>
</li>
<li class="chapter " data-level="3.1.6.7" data-path="1-06-07-floating-point.html">
<a href="1-06-07-floating-point.html">
Floating-point Numbers
</a>
</li>
<li class="chapter " data-level="3.1.6.8" data-path="1-06-08-constants.html">
<a href="1-06-08-constants.html">
Numeric Constants
</a>
</li>
<li class="chapter " data-level="3.1.6.9" data-path="1-06-09-complex-numbers.html">
<a href="1-06-09-complex-numbers.html">
Complex Numbers
</a>
</li>
<li class="chapter " data-level="3.1.6.10" data-path="1-06-10-arithmetic.html">
<a href="1-06-10-arithmetic.html">
Arithmetic
</a>
</li>
<li class="chapter " data-level="3.1.6.11" data-path="1-06-11-more-arithmetic.html">
<a href="1-06-11-more-arithmetic.html">
More Arithmetic
</a>
</li>
<li class="chapter " data-level="3.1.6.12" data-path="1-06-12-even-more-arithmetic.html">
<a href="1-06-12-even-more-arithmetic.html">
Even More Arithmetic
</a>
</li>
<li class="chapter " data-level="3.1.6.13" data-path="1-06-13-exponents.html">
<a href="1-06-13-exponents.html">
Exponents
</a>
</li>
<li class="chapter " data-level="3.1.6.14" data-path="1-06-14-logarithms.html">
<a href="1-06-14-logarithms.html">
Logarithms
</a>
</li>
<li class="chapter " data-level="3.1.6.15" data-path="1-06-15-trigonometry.html">
<a href="1-06-15-trigonometry.html">
Trigonometry
</a>
</li>
<li class="chapter " data-level="3.1.6.16" data-path="1-06-16-psuedorandom-numbers.html">
<a href="1-06-16-psuedorandom-numbers.html">
Pseudo-Random Numbers
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="3.1.7" data-path="1-07-0-arrays.html">
<a href="1-07-0-arrays.html">
Extra Credit: Arrays and Vectors
</a>
</li>
<li class="chapter " data-level="3.1.8" data-path="1-08-0-variables.html">
<a href="1-08-0-variables.html">
Variables, Parameters, and Constants
</a>
</li>
<li class="chapter " data-level="3.1.9" data-path="1-09-0-closures.html">
<a href="1-09-0-closures.html">
Extra Credit: Closures
</a>
</li>
<li class="chapter " data-level="3.1.10" data-path="1-10-0-functions.html">
<a href="1-10-0-functions.html">
Functions and Macros
</a>
</li>
<li class="chapter " data-level="3.1.11" data-path="1-11-0-text-adventure.html">
<a href="1-11-0-text-adventure.html">
Extra Credit: A Simple Text Adventure
</a>
</li>
<li class="chapter " data-level="3.1.12" data-path="1-12-0-namespaces.html">
<a href="1-12-0-namespaces.html">
Namespaces, Symbols, Packages, and Systems
</a>
</li>
<li class="chapter " data-level="3.1.13" data-path="1-13-0-simple-web-app.html">
<a href="1-13-0-simple-web-app.html">
Extra Credit: A Simple Web Application
</a>
</li>
<li class="chapter " data-level="3.1.14" data-path="1-14-0-conditionals.html">
<a href="1-14-0-conditionals.html">
Conditionals
</a>
</li>
<li class="chapter " data-level="3.1.15" data-path="1-15-0-command-line-utility.html">
<a href="1-15-0-command-line-utility.html">
Extra Credit: Command-Line Utilities
</a>
</li>
<li class="chapter " data-level="3.1.16" data-path="1-16-0-map-loop.html">
<a href="1-16-0-map-loop.html">
Mapping and Looping
</a>
</li>
<li class="chapter " data-level="3.1.17" data-path="1-17-0-iterate.html">
<a href="1-17-0-iterate.html">
Extra Credit: Revisiting Loops with Iterate
</a>
</li>
<li class="chapter " data-level="3.1.18" data-path="1-18-0-format.html">
<a href="1-18-0-format.html">
Format Strings
</a>
</li>
<li class="chapter " data-level="3.1.19" data-path="1-19-0-dsl.html">
<a href="1-19-0-dsl.html">
Extra Credit: Domain Specific Languages
</a>
</li>
<li class="chapter " data-level="3.1.20" data-path="1-20-0-review.html">
<a href="1-20-0-review.html">
Part One in Review
</a>
</li>
</ul>
</li>
<li class="header">PART TWO</li>
<li class="chapter " data-level="4.1" data-path="2-0-0-overview.html">
<a href="2-0-0-overview.html">
The Suffusion of Blue
</a>
<ul class="articles">
<li class="chapter " data-level="4.1.1" data-path="2-01-0-programming-paradigms.html">
<a href="2-01-0-programming-paradigms.html">
Programming Paradigms
</a>
</li>
<li class="chapter " data-level="4.1.2" data-path="2-02-0-regex.html">
<a href="2-02-0-regex.html">
Extra Credit: Regular Expressions
</a>
</li>
<li class="chapter " data-level="4.1.3" data-path="2-03-0-objects-control.html">
<a href="2-03-0-objects-control.html">
Objects and Control Structures
</a>
</li>
<li class="chapter " data-level="4.1.4" data-path="2-04-0-data-persistence.html">
<a href="2-04-0-data-persistence.html">
Extra Credit: Persistence and Databases
</a>
</li>
<li class="chapter " data-level="4.1.5" data-path="2-05-0-extended-types.html">
<a href="2-05-0-extended-types.html">
Extended Types
</a>
</li>
<li class="chapter " data-level="4.1.6" data-path="2-06-0-threads-memos-parallel.html">
<a href="2-06-0-threads-memos-parallel.html">
Extra Credit: Concurrency and Memoization
</a>
</li>
<li class="chapter " data-level="4.1.7" data-path="2-07-0-logic-and-more-math.html">
<a href="2-07-0-logic-and-more-math.html">
Logic and Advanced Math
</a>
</li>
<li class="chapter " data-level="4.1.8" data-path="2-08-0-number-theory.html">
<a href="2-08-0-number-theory.html">
Extra Credit: Number Theory
</a>
</li>
<li class="chapter " data-level="4.1.9" data-path="2-09-0-binary-octets-bits.html">
<a href="2-09-0-binary-octets-bits.html">
Binary Streams, Octet-Vectors, and Bit-Vectors
</a>
</li>
<li class="chapter " data-level="4.1.10" data-path="2-10-0-improved-text-adventure-engine.html">
<a href="2-10-0-improved-text-adventure-engine.html">
Extra Credit: An Improved Text Adventure Engine
</a>
</li>
<li class="chapter " data-level="4.1.11" data-path="2-11-0-conditions.html">
<a href="2-11-0-conditions.html">
Conditions and Error Handling
</a>
</li>
<li class="chapter " data-level="4.1.12" data-path="2-12-0-2d-game.html">
<a href="2-12-0-2d-game.html">
Extra Credit: Write a 2D Game
</a>
</li>
<li class="chapter " data-level="4.1.13" data-path="2-13-0-compiler.html">
<a href="2-13-0-compiler.html">
The Compiler
</a>
</li>
<li class="chapter " data-level="4.1.14" data-path="2-14-0-tree-shaker.html">
<a href="2-14-0-tree-shaker.html">
Extra Credit: Write a Tree-Shaker
</a>
</li>
<li class="chapter " data-level="4.1.15" data-path="2-15-0-docs-and-inspection.html">
<a href="2-15-0-docs-and-inspection.html">
Documentation and Inspection
</a>
</li>
<li class="chapter " data-level="4.1.16" data-path="2-16-0-foreign-libs.html">
<a href="2-16-0-foreign-libs.html">
Extra Credit: Foreign Libraries in Lisp
</a>
</li>
<li class="chapter " data-level="4.1.17" data-path="2-17-0-debugging-testing.html">
<a href="2-17-0-debugging-testing.html">
Debugging and Unit Testing
</a>
</li>
<li class="chapter " data-level="4.1.18" data-path="2-18-0-ffi.html">
<a href="2-18-0-ffi.html">
Extra Credit: Write a Foreign Function Interface
</a>
</li>
<li class="chapter " data-level="4.1.19" data-path="2-19-0-essential-libs.html">
<a href="2-19-0-essential-libs.html">
Essential Lisp Libraries
</a>
</li>
<li class="chapter " data-level="4.1.20" data-path="2-20-0-packaging-libs.html">
<a href="2-20-0-packaging-libs.html">
Extra Credit: Packaging Lisp Libraries
</a>
</li>
<li class="chapter " data-level="4.1.21" data-path="2-21-0-review.html">
<a href="2-21-0-review.html">
Detailed Syntax Review
</a>
</li>
</ul>
</li>
<li class="header">PART THREE</li>
<li class="chapter " data-level="5.1" data-path="3-00-00-overview.html">
<a href="3-00-00-overview.html">
Lisp So(u)rcery
</a>
<ul class="articles">
<li class="chapter " data-level="5.1.1" data-path="3-01-00-web-apps.html">
<a href="3-01-00-web-apps.html">
Real-world Web Apps
</a>
</li>
<li class="chapter " data-level="5.1.2" data-path="3-02-00-typesetting.html">
<a href="3-02-00-typesetting.html">
Typesetting
</a>
</li>
<li class="chapter " data-level="5.1.3" data-path="3-03-00-mobile.html">
<a href="3-03-00-mobile.html">
Native Mobile Applications
</a>
</li>
<li class="chapter " data-level="5.1.4" data-path="3-04-00-gui.html">
<a href="3-04-00-gui.html">
Cross-platform Desktop Applications
</a>
</li>
<li class="chapter " data-level="5.1.5" data-path="3-05-00-system-utils.html">
<a href="3-05-00-system-utils.html">
Drivers, Daemons, and System-Utilities
</a>
</li>
<li class="chapter " data-level="5.1.6" data-path="3-06-00-reverse-engineering.html">
<a href="3-06-00-reverse-engineering.html">
Reverse Engineering
</a>
</li>
<li class="chapter " data-level="5.1.7" data-path="3-07-00-graphics.html">
<a href="3-07-00-graphics.html">
Graphics Rendering
</a>
</li>
<li class="chapter " data-level="5.1.8" data-path="3-08-00-gaming.html">
<a href="3-08-00-gaming.html">
OpenGL, SDL, and 3D Game Development
</a>
</li>
<li class="chapter " data-level="5.1.9" data-path="3-09-00-audio.html">
<a href="3-09-00-audio.html">
Audio Generation and Manipulation
</a>
</li>
<li class="chapter " data-level="5.1.10" data-path="3-10-00-data.html">
<a href="3-10-00-data.html">
Data Aggregation and Analysis
</a>
</li>
<li class="chapter " data-level="5.1.11" data-path="3-11-00-cryptosec.html">
<a href="3-11-00-cryptosec.html">
Cryptography and Security
</a>
</li>
<li class="chapter " data-level="5.1.12" data-path="3-12-00-fintech.html">
<a href="3-12-00-fintech.html">
Financial Software and Crypto-Currencies
</a>
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<h1 id="exercise-118">Exercise 1.1.8</h1>
<h2 id="configuring-your-development-environment">Configuring Your Development Environment</h2>
<p>Now that you&apos;ve gotten yourself a feel for Common Lisp, you&apos;ll want to spend a little time configuring your development environment so that you can dive right into the code. A lot of configuration choices are a matter of personal taste, but as long as you feel comfortable, and nothing interferes with your ability to learn and hack in Lisp, you can&apos;t really go wrong.</p>
<h3 id="the-in-browser-repl">The In-Browser REPL</h3>
<p>(Deprecated)</p>
<p>You can start hacking in Lisp right away with the in-browser, javascript-powered REPL under the &quot;Try Lisp&quot; section of this site, listed in the navigation bar at the top of each page. It takes you through a quick tour of Common Lisp so you can get your feet wet without installing anything.</p>
<p>To continue with this book, however, you will need to install Common Lisp on your computer. Not all the exercises in this book will run in the in-browser REPL, so make sure you get SBCL installed and working correctly before moving on to the next exercise.</p>
<h3 id="installing-sbcl">Installing SBCL</h3>
<p>Steel Bank Common Lisp is one of the easiest Lisp implementations to get up and running&#x2014;it has out of the box support for a wide selection of platforms, and is considered to be the most robust implementation available. Since it automatically compiles everything you enter at the REPL, your running Lisp processes also benefit from a major speed-boost over other Lisps.</p>
<div class="alert alert-info">
<p>
<strong>Note:</strong> the SBCL REPL is minimal by design, since it is primarily used from within Emacs+SLIME which provides its own custom prompt, history, completion, multi-line editing capabilities, and more. In order to use it effectively straight from the command-line, you will need to install a separate tool on OS X and Linux called `rlwrap`, a readline wrapper. It provides evaluation history, multi-line editing, and can be configured for completions and filters. You can read more about `rlwrap` here: <a href="http://utopia.knoware.nl/~hlub/uck/rlwrap/" target="_blank">utopia.knoware.nl/~hlub/uck/rlwrap/</a>.
</p>
</div>
<h4 id="windows">Windows</h4>
<p>The latest SBCL installer packages for Windows, in separate versions for 32 and 64-bit systems, are available on the official downloads page.</p>
<p>Once installed, you can run SBCL from the Start menu, or call it from a command-line window. If you have PowerShell installed, it offers better features than the default command line.</p>
<h4 id="os-x">OS X</h4>
<p>On Mac OS X, you will want to install SBCL through the Homebrew package manager.</p>
<p>You will also want to install the <code>rlwrap</code> package, and run SBCL from the terminal as follows:</p>
<pre><code class="lang-sh">$ rlwrap sbcl
</code></pre>
<h4 id="linux">Linux</h4>
<p>Most Linux distros have the latest, or a very recent, version of SBCL in their official repositories. You can simply install it from there.</p>
<p>You will also want to install the <code>rlwrap</code> package, and run SBCL from the shell as follows:</p>
<pre><code class="lang-sh">$ rlwrap sbcl
</code></pre>
<h4 id="debianubuntu">Debian/Ubuntu</h4>
<p>The packages for SBCL in Apt tend to be severely out-of-date, so if you&apos;re using Debian or Ubuntu, you will have a little extra work to do.</p>
<p>First, install the version of SBCL available for your distro in Apt.</p>
<p>Using the old version of SBCL, you may now compile the latest version of SBCL from source.</p>
<h3 id="installing-quicklisp">Installing Quicklisp</h3>
<p>Once you have SBCL up and running, the first thing you should do is install Quicklisp. It&apos;s a package manager for Lisp, and will allow you to dynamically load community-supported libraries (which typically include ASDF systems and their associated Lisp packages) into your running Lisp image. It also automatically resolves dependencies for your own Lisp projects.</p>
<p>From the command-line:</p>
<pre><code class="lang-sh">$ curl -O http://beta.quicklisp.org/quicklisp.lisp
$ rlwrap sbcl --load quicklisp.lisp
</code></pre>
<p>You will then find yourself at the Lisp REPL, with some instructions:</p>
<pre><code class="lang-lisp"> ==== quicklisp quickstart loaded ====
To continue, evaluate: (quicklisp-quickstart:install)
</code></pre>
<p>Like the instructions tell you, type that at the REPL prompt:</p>
<pre><code class="lang-lisp">* (<span class="hljs-name">quicklisp-quickstart</span><span class="hljs-symbol">:install</span>)
</code></pre>
<p>Once it finishes downloading its dependencies and setting up the working folders, it will prompt you with another message confirming it was installed. Now you will want to set it up to load automatically every time you start SBCL:</p>
<pre><code class="lang-lisp">* (<span class="hljs-name">ql</span><span class="hljs-symbol">:add-to-init-file</span>)
</code></pre>
<p>This function will tell you exactly what it&apos;s doing before it changes your lisp <code>.*rc</code> file. If you&apos;re ready, press Enter to continue when it prompts you to do so.</p>
<p>That&apos;s it! You can now use <code>ql:system-apropos</code> to search for libraries, and <code>ql:quickload</code> to download and install them.</p>
<p>You can put your Lisp projects under <code>~/quicklisp/local-projects/</code> so that Quicklisp can find them automatically; then you will be able to quickload your own projects just like the libraries distributed with Quicklisp.</p>
<h3 id="choosing-a-text-editor">Choosing a Text Editor</h3>
<p>If you ask any Lisp developer what editor you should be using, or what IDE is available for Common Lisp, the first thing they&apos;ll tell you is, Emacs. Emacs and SLIME (the Superior Lisp Interaction Mode for Emacs), makes a powerful combination. You can control the entire environment with your keyboard, never having to waste time reaching for the mouse; run, test, and debug code in the REPL as you write it in another buffer; experiment and explore alternate approaches to solving the same problem, profiling your code to get the best performance; and have the full Common Lisp HyperSpec at your fingertips. The only problem is, some users really dislike Emacs, or simply don&apos;t know it. The steep learning curve can be a real damper to your progress when coming to both Lisp and Emacs as a newbie; so the policy of this book is, use what you know, and make it work until you know Lisp well enough to get comfortable learning Emacs. If you wait until the right time, learning Emacs will be a boost to your productivity, not a hindrance.</p>
<div class="alert alert-info">
<strong>Note:</strong>
<p>If you want to move ahead with Emacs, detailed instructions for setting up the Emacs Live environment with support for Common Lisp are available in the next chapter, your first Extra Credit exercise.</p>
</div>
<p>If you know Emacs and have a great disdain for it, far preferring Vim, you can take advantage of most of the features of SLIME through the Vim package, Slimv.</p>
<p>For users who have no experience with Emacs or Vim, all you really need at the moment is a simple text editor. Anything more will probably just confuse you, and keep you from focusing on Lisp itself. A few worth checking out are:</p>
<ul>
<li>Sublime Text: very well supported, extensible, and actively maintained; syntax highlighting for Lisp is built-in; a REPL plugin is available so you can get a similar experience to Emacs without as steep a learning curve. Free to try, but requires a paid license for continued use. It is available to download for Windows, OS X, and Linux.</li>
<li>Atom: currently in beta, built entirely on Web technologies, GitHub&apos;s Atom Editor is like a stripped-down Sublime Text with a few unique features. A plugin for Lisp syntax highlighting is available for download within the editor settings. Binaries are available to download for OS X and Windows 7 and 8; the source code is available to compile for other systems, although in Linux it may be available in your package manager.</li>
<li>Cloud9: the Cloud9 service is like Sublime Text or Atom in the browser. You can access your code from anywhere, sync it up with your repo, collaborate on code, and more. Syntax highlighting for Lisp is built-in. Cloud9 has both free and premium plans. Best viewed in Chrome, Safari, and Firefox.</li>
<li>Notepad++: A clean and simple text editor with syntax highlighting for Lisp. Available for Windows.</li>
</ul>
<p>Other popular text and code editors, such as BBedit, TextWrangler, and Gedit, do not have syntax highlighting for Lisp.</p>
<h3 id="working-from-the-command-line">Working From the Command-Line</h3>
<p>(writing notes)</p>
<ul>
<li>Importance of being comfortable with the Command-Line</li>
<li>Running and Compiling Lisp from the Command-Line</li>
<li>Lisp shell scripts</li>
<li>Launching the REPL</li>
</ul>
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