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/usr/share/help/C/gnome-terminal/txt-links.page is in gnome-terminal-data 3.18.3-1ubuntu1.

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The actual contents of the file can be viewed below.

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<page xmlns="http://projectmallard.org/1.0/"
      type="guide"
      id="txt-links">

  <info>
    <link type="guide" xref="index#textoutput"/>
    <revision version="0.1" date="2013-03-03" status="candidate"/>

    <credit type="author copyright">
      <name>Sindhu S</name>
      <email>sindhus@live.in</email>
      <years>2013</years>
    </credit>
    <credit type="copyright editor">
      <name>Ekaterina Gerasimova</name>
      <email>kittykat3756@gmail.com</email>
      <years>2013</years>
    </credit>
    <credit type="copyright editor">
      <name>Michael Hill</name>
      <email>mdhillca@gmail.com</email>
      <years>2013</years>
    </credit>

    <include href="legal.xml" xmlns="http://www.w3.org/2001/XInclude"/>

    <desc>Open links to web and email addresses.</desc>
  </info>

  <title>Hyperlinks and email addresses</title>

  <p><app>Terminal</app> parses the terminal output and automatically detects
  snippets of text that are web addresses or email addresses. Web and email
  addresses are automatically highlighted when you point your cursor to the
  text, indicating that the link can be opened in an application.</p>

  <p>For example, you may see <output>http://www.gnome.org</output> or
  <output>username@example.com</output> generated as a part of terminal output by
  programs such as <app>wget</app> or <app>curl</app>.</p>

  <section id="hyperlinks">
    <title>Open or copy web addresses</title>

    <p>Web addresses are also called hyperlinks. They can be copied to the
    system clipboard or opened in your preferred web browser.</p>

    <list>
      <item>
        <p>Copy a hyperlink:</p>
        <steps>
          <item>
            <p>Right click on the link in <app>Terminal</app>.</p>
          </item>
          <item>
          <p>Select <gui style="menuitem">Copy Link Address</gui>.</p>
          </item>
        </steps>
      </item>
      <item>
        <p>Open a hyperlink in your web browser:</p>
        <steps>
          <item>
            <p>Right click on the hyperlink.</p>
          </item>
          <item>
            <p>Select <gui style="menuitem">Open Link</gui>.</p>
          </item>
        </steps>
      </item>
    </list>

  </section>

  <section id="email">
    <title>Email or copy email addresses</title>

    <p>Email addresses can be copied to the system clipboard or opened in your
    preferred email client.</p>

    <list>
      <item>
        <p>Copy an email address:</p>
        <steps>
          <item>
            <p>Right click on the email address in <app>Terminal</app>.</p>
          </item>
          <item>
          <p>Select <gui style="menuitem">Copy E-mail Address</gui>.</p>
          </item>
        </steps>
      </item>
      <item>
        <p>Send mail to the email address using your email client:</p>
        <steps>
          <item>
            <p>Right click on the address.</p>
          </item>
          <item>
            <p>Select <gui style="menuitem">Sent Mail To…</gui>.</p>
          </item>
        </steps>
      </item>
    </list>

  </section>

</page>