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+<!DOCTYPE html>
+<html dir="ltr" lang="en">
+    <head>
+        <meta charset='utf-8'>
+        <title>2.4. Consoles, terminals and shells</title>
+    </head>
+    <body>
+
+        <a href="index.html">Core OS Index</a>
+
+        <h1>2.4. Consoles, terminals and shells</h1>
+
+        <dl>
+            <dt>Consoles</dt>
+            <dd>Consoles and Virtual Consoles provides input and output
+            with a computer using serial communication. Initially console
+            was a physical device containing a terminal with a monitor and
+            keyboard.</dd>
+
+            <dt>Terminal</dt>
+
+            <dd>A terminal provides text input/output environment
+            that can be used to interact with a console (monitor or keyboard)
+            or transmitted using serial communication.
+            Initially a terminal was a electronic device connected to a
+            microcomputer or mainframe that take input from a keyboard and
+            output to a text mode screen. Terminals or ttys are provided by the
+            kernel. Example of terminal emulators; tmux, ssh, st.<dd>
+
+            <dt>Shell</dt>
+            <dd>Shell are command line interpreter that a terminal
+            runs. Shells also manage foreground and background
+            processes. Example of shells dash and bash.</dd>
+        </dl>
+
+
+        <p>Content of /etc/inittab shows layout organization and default
+        run level and ttys;</p>
+
+        <pre>
+        #
+        # /etc/inittab: system runlevel description
+        #
+
+        # Runlevels:
+        #  0	Halt
+        #  1(S)	Single-user
+        #  2	Multi-user
+        #  3-5	Not used
+        #  6	Reboot
+
+        id:2:initdefault:
+
+        rc::sysinit:/etc/rc
+        rs:S1:wait:/etc/rc.single
+        rm:2:wait:/etc/rc.multi
+        rd:06:wait:/etc/rc.shutdown
+        su:S:wait:/sbin/sulogin -p
+
+        c1:2:respawn:/sbin/agetty --noclear 38400 tty1 linux
+        c2:2:respawn:/sbin/agetty 38400 tty2 linux
+        c3:2:respawn:/sbin/agetty 38400 tty3 linux
+        c4:2:respawn:/sbin/agetty 38400 tty4 linux
+        c5:2:respawn:/sbin/agetty 38400 tty5 linux
+        c6:2:respawn:/sbin/agetty 38400 tty6 linux
+        #s1:2:respawn:/sbin/agetty 38400 ttyS0 vt100
+
+        ca::ctrlaltdel:/sbin/shutdown -t3 -r now
+
+        # End of file
+        </pre>
+
+
+        <a href="index.html">Core OS Index</a>
+        <p>This is part of the Tribu System Documentation.
+        Copyright (C) 2020
+        Tribu Team.
+        See the file <a href="../fdl-1.3-standalone.html">Gnu Free Documentation License</a>
+        for copying conditions.</p>
+    </body>
+</html>