{% extends 'missions/shell/base.html' %}
{% comment %}
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{% endcomment %}

{% block mission_main %}
<div class='submodule fat'>
  <div class='head'>
    <h3>Using command line shell</h3>
  </div>
  <div class="body">

      <h3>What is "the shell"?</h3>
      <p>In simple words, the shell is a program that takes your commands from the
      keyboard and gives them to the operating system to perform. In the old
      days, it was the only user interface available on a computer.
      Nowadays, we have graphical user interfaces (GUIs) in addition to command
      line interfaces (CLIs) such as the shell.</p>

      <p>On most Linux systems a program called
      <a href="http://www.gnu.org/software/bash/#content">bash</a> acts as the
      shell program. There are several additional shell programs available on a
      typical Linux system. These include: <a href="http://www.kornshell.com/info/">ksh</a>,
      <a href="http://www.tcsh.org/Welcome">tcsh</a> and
      <a href="http://zsh.sourceforge.net/">zsh</a>.</p>

      <h3>How to start the shell?</h3>
      <p>Most window managers have a way to launch programs from a menu. Look
      through the list of programs to see if anything looks like a terminal
      emulator program. In KDE, you can find <a href="https://konsole.kde.org">"konsole"</a>
      and "terminal" on the Utilities menu. In Gnome, you can find "color xterm,"
      "regular xterm," and <a href="https://help.gnome.org/users/gnome-terminal/stable/overview.html.en">"gnome-terminal"</a>
      on the Utilities menu. You can start up as many of these as you want and
      play with them. While there are a number of different terminal emulators,
      they all do the same thing. They give you access to a shell session. You
      may develop a preference for one, depending on different features each one
      provides. Ubuntu users may see <a href="https://help.ubuntu.com/community/UsingTheTerminal#Starting_a_Terminal">here</a>
      for a detailed description about how to start a terminal.</p>

      <p>For the rest of the mission we recommend you to start your shell and
      play with the commands as we present them before you.</p>

      <h3>What you'll learn</h3>
      <p>After completing this mission, you will have a basic understanding of
      the shell and some basic commands, which will help you in understanding
      other missions.</p>

      <h3>Getting started</h3>
      <p>This mission will provide you information about few of the most frequently
      used commands in the shell. This mission also consist of a "Challenge",
      which will be a question at the end of the tutorial of every command.</p>
      <p class="next_mission_link">
      <a href='{% url "mysite.missions.shell.views.file_and_directory" %}'>Get started with the shell &raquo;</a></p>

  </div>
</div>
{% endblock %}