path: root/lib/stdlib/doc/src/shell_default.xml

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE erlref SYSTEM "erlref.dtd">

<erlref>
  <header>
    <copyright>
      <year>1996</year>
      <year>2016</year>
      <holder>Ericsson AB, All Rights Reserved</holder>
    </copyright>
    <legalnotice>
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
 
      http://www.apache.org/licenses/LICENSE-2.0

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  See the License for the specific language governing permissions and
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  The Initial Developer of the Original Code is Ericsson AB.
    </legalnotice>

    <title>shell_default</title>
    <prepared>Joe Armstrong</prepared>
    <responsible>Joe Armstrong</responsible>
    <docno></docno>
    <approved>Bjarne D&auml;cker</approved>
    <checked>Joe Armstrong</checked>
    <date>1996-09-09</date>
    <rev>A</rev>
    <file>shell_default.sgml</file>
  </header>
  <module>shell_default</module>
  <modulesummary>Customizing the Erlang Environment</modulesummary>
  <description>
    <p>The functions in <c>shell_default</c> are called when no module
      name is given in a shell command.
      </p>
    <p>Consider the following shell dialogue:</p>
    <pre>
1 > <input>lists:reverse("abc").</input>
"cba"
2 > <input>c(foo).</input>
{ok, foo}    </pre>
    <p>In command one, the module <c>lists</c> is called. In command
      two, no module name is specified. The shell searches the modules
      <c>user_default</c> followed by <c>shell_default</c> for the
      function <c>foo/1</c>.
      </p>
    <p><c>shell_default</c> is intended for "system wide"
      customizations to the shell. <c>user_default</c> is intended for
      "local" or individual user customizations.</p>
  </description>

  <section>
    <title>Hint</title>
    <p>To add your own commands to the shell, create a module called
      <c>user_default</c> and add the commands you want. Then add the
      following line as the <em>first</em> line in your <c>.erlang</c> file in your
      home directory. </p>
    <pre>
code:load_abs("$PATH/user_default").    </pre>
    <p><c>$PATH</c> is the directory where your
      <c>user_default</c> module can be found.</p>
  </section>
</erlref>