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+accesskey="P">Prev</a></td>
+<td width="80%" align="center" valign="bottom">Chapter 17 Emacs</td>
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+
+<div class="SECT1">
+<h1 class="SECT1"><a id="EMACS-MODES" name="EMACS-MODES">17.3 Modes</a></h1>
+
+<p>Every buffer in Emacs has an associated mode. This mode is very different from the
+idea of modes in <tt class="COMMAND">vi</tt>: a mode tells you what kind of buffer you
+are in. For example, there is text-mode for normal text files, but there are also modes
+such as c-mode for editing C programs, sh-mode for editing shell scripts, latex-mode for
+editing <b class="APPLICATION">LaTeX</b> files, mail-mode for editing email and news
+messages, etc. A mode provides special customizations and functionality that is useful
+for the kind of file you are editing. It is even possible for a mode to redefine keys and
+key commands. For example, in Text mode, the Tab key simply jumps to the next tab stop,
+but in many programming language modes, the <b class="KEYCAP">Tab</b> key indents the
+current line according to the depth of the block that line is in.</p>
+
+<p>The modes mentioned above are called major modes. Each buffer has exactly one major
+mode. Additionally, a buffer can have one or more minor modes. A minor mode provides
+additional features that may be useful for certain editing tasks. For example, if you hit
+the <b class="KEYCAP">INSERT</b> key, you invoke overwrite-mode, which does what you'd
+expect. There is also an auto-fill-mode, which is handy in combination with text-mode or
+latex-mode: it causes each line that you type to be automatically wrapped once the line
+reaches a certain number of characters. Without auto-fill-mode, you have to type <b
+class="KEYCAP">M</b>-<b class="KEYCAP">q</b> to fill out a paragraph. (Which you can also
+use to reformat a paragraph after you've edited some text in it and it is no longer
+nicely filled out.)</p>
+
+<div class="SECT2">
+<h2 class="SECT2"><a id="EMACS-OPENING-FILES" name="EMACS-OPENING-FILES">17.3.1 Opening
+files</a></h2>
+
+<p>To open a file in Emacs, type</p>
+
+<table border="0" bgcolor="#E0E0E0" width="100%">
+<tr>
+<td>
+<pre class="SCREEN">
+<kbd class="USERINPUT">C-x C-f</kbd>
+</pre>
+</td>
+</tr>
+</table>
+
+<p>Emacs will ask you for the name of the file, filling in some default path for you
+(which is usually <tt class="FILENAME">~/</tt> ). After you type the filename (you can
+use <b class="KEYCAP">Tab</b> completion) and hit <b class="KEYCAP">ENTER</b> , Emacs
+will open the file in a new buffer and display that buffer on the screen.</p>
+
+<div class="NOTE">
+<table class="NOTE" width="100%" border="0">
+<tr>
+<td width="25" align="CENTER" valign="TOP"><img src="./imagelib/admon/note.png"
+hspace="5" alt="Note" /></td>
+<td align="LEFT" valign="TOP">
+<p>Emacs will automatically create a new buffer, it will not load the file into the
+current buffer.</p>
+</td>
+</tr>
+</table>
+</div>
+
+<p>In order to create a new file in emacs, you cannot just go typing right away. You
+first have to create a buffer for it, and come up with a filename. You do this by typing
+<b class="KEYCAP">C</b>-<b class="KEYCAP">x</b> <b class="KEYCAP">C</b>-<b
+class="KEYCAP">f</b> and typing a filename, just as if you were opening an existing file.
+Emacs will notice that the file you typed doesn't exist, and will create a new buffer and
+report &#8220;(New file)&#8221; in the minibuffer.</p>
+
+<p>When you type <b class="KEYCAP">C</b>-<b class="KEYCAP">x</b> <b
+class="KEYCAP">C</b>-<b class="KEYCAP">f</b> and then enter a directory name instead of a
+filename, Emacs will create a new buffer in which you will find a list of all the files
+in that directory. You can move the cursor to the file that you are looking for and type
+, and Emacs will open it. (There are in fact a lot more actions you can perform here,
+such as deleting, renaming and moving files, etc. Emacs is now in dired-mode, which is
+basically a simple file manager.)</p>
+
+<p>When you have typed <b class="KEYCAP">C</b>-<b class="KEYCAP">x</b> <b
+class="KEYCAP">C</b>-<b class="KEYCAP">f</b> and suddenly change your mind, you can type
+<b class="KEYCAP">C</b>-<b class="KEYCAP">g</b> to cancel the action. <b
+class="KEYCAP">C</b>-<b class="KEYCAP">g</b> works almost everywhere where you want to
+cancel an action or command that you've started but don't want to finish.</p>
+</div>
+</div>
+
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