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<title>Nine Nines: Erlang shell</title>
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<h1 class="lined-header"><span>Erlang shell</span></h1>
<div class="paragraph"><p>Erlang.mk provides a convenient target for starting a shell
with all the paths set properly to experiment with your code.</p></div>
<div class="sect1">
<h2 id="_configuration">Configuration</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <code>SHELL_DEPS</code> variable can be used to define dependencies
that are only to be used when the <code>make shell</code> command is called.
For example, if you want to use <em>kjell</em> as your shell:</p></div>
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<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="color: #009900">SHELL_DEPS =</span> kjell</tt></pre></div></div>
<div class="paragraph"><p>Dependencies are downloaded and compiled the first time you
run the <code>make shell</code> command.</p></div>
<div class="paragraph"><p>You can customize the executable used to start the Erlang shell.
To continue with our example, if you want to use <em>kjell</em> as your
shell, you also need to change <code>SHELL_ERL</code> and point it to the
<code>kjell</code> executable:</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="color: #009900">SHELL_ERL =</span> <span style="color: #009900">$(DEPS_DIR)</span>/kjell/bin/kjell</tt></pre></div></div>
<div class="paragraph"><p>You can specify additional options to be used when starting the
shell using the <code>SHELL_OPTS</code> variable:</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="color: #009900">SHELL_OPTS =</span> -setcookie chocolate</tt></pre></div></div>
<div class="paragraph"><p>Any of the usual <code>erl</code> options can be used, including <code>-eval</code>:</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="color: #009900">SHELL_OPTS =</span> -eval <span style="color: #FF0000">'my_app:run()'</span></tt></pre></div></div>
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<div class="sect1">
<h2 id="_usage">Usage</h2>
<div class="sectionbody">
<div class="paragraph"><p>To start the shell, all you need is the following command:</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>$ make shell</tt></pre></div></div>
<div class="paragraph"><p>The shell can be stopped as usual with a double Ctrl+C or the
command <code>q().</code>.</p></div>
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