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<h1>5 tty - A command line interface</h1>
<p><span class="code">tty</span> is a simple command line interface program where keystrokes are collected and interpreted. Completed lines are sent to the shell for interpretation. There is a simple history mechanism, which saves previous lines. These can be edited before sending them to the shell.
<span class="code">tty</span> is started when Erlang is started with the command:<br></p>
<p><strong>erl</strong></p>
<p><span class="code">tty</span> operates in one of two modes:<br></p>
<ul>
<li>
<p><strong>normal mode</strong>, in which lines of text can be edited and sent to the shell.</p>
</li>
<li>
<p><strong>shell break</strong> mode, which allows the user to kill the current shell, start multiple shells etc. Shell break mode is started by typing <strong>Control G</strong>.</p>
</li>
</ul>
<h3><a name="id81651">5.1
Normal Mode</a></h3>
<p>In normal mode keystrokes from the user are collected and interpreted by <span class="code">tty</span>. Most of the <strong>emacs</strong> line editing commands are supported. The following is a complete list of the supported line editing commands.<br></p>
<p><strong>Note:</strong> The notation <span class="code">C-a</span> means pressing the control key and the letter <span class="code">a</span> simultaneously. <span class="code">M-f</span> means pressing the <span class="code">ESC</span> key followed by the letter <span class="code">f</span>.
</p>
<table border="1" cellpadding="2" cellspacing="0">
<tr>
<td align="left" valign="middle"><strong>Key Sequence</strong></td>
<td align="left" valign="middle"><strong>Function</strong></td>
</tr>
<tr>
<td align="left" valign="middle">C-a</td>
<td align="left" valign="middle">Beginning of line</td>
</tr>
<tr>
<td align="left" valign="middle">C-b</td>
<td align="left" valign="middle">Backward character</td>
</tr>
<tr>
<td align="left" valign="middle">M-b</td>
<td align="left" valign="middle">Backward word</td>
</tr>
<tr>
<td align="left" valign="middle">C-d</td>
<td align="left" valign="middle">Delete character</td>
</tr>
<tr>
<td align="left" valign="middle">M-d</td>
<td align="left" valign="middle">Delete word</td>
</tr>
<tr>
<td align="left" valign="middle">C-e</td>
<td align="left" valign="middle">End of line</td>
</tr>
<tr>
<td align="left" valign="middle">C-f</td>
<td align="left" valign="middle">Forward character</td>
</tr>
<tr>
<td align="left" valign="middle">M-f</td>
<td align="left" valign="middle">Forward word</td>
</tr>
<tr>
<td align="left" valign="middle">C-g</td>
<td align="left" valign="middle">Enter shell break mode</td>
</tr>
<tr>
<td align="left" valign="middle">C-k</td>
<td align="left" valign="middle">Kill line</td>
</tr>
<tr>
<td align="left" valign="middle">C-l</td>
<td align="left" valign="middle">Redraw line</td>
</tr>
<tr>
<td align="left" valign="middle">C-n</td>
<td align="left" valign="middle">Fetch next line from the history buffer</td>
</tr>
<tr>
<td align="left" valign="middle">C-p</td>
<td align="left" valign="middle">Fetch previous line from the history buffer</td>
</tr>
<tr>
<td align="left" valign="middle">C-t</td>
<td align="left" valign="middle">Transpose characters</td>
</tr>
<tr>
<td align="left" valign="middle">C-y</td>
<td align="left" valign="middle">Insert previously killed text</td>
</tr>
</table>
<em>Table
5.1:
tty text editing</em>
<h3><a name="id82034">5.2
Shell Break Mode</a></h3>
<p><strong>tty</strong> enters <strong>shell</strong> break mode when you type <strong>Control G</strong>. In this mode you can:<br></p>
<ul>
<li>
<p>Kill or suspend the current shell</p>
</li>
<li>
<p>Connect to a suspended shell</p>
</li>
<li>
<p>Start a new shell</p>
</li>
</ul>
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