<HTML ><HEAD ><TITLE >What is a console?</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="Remote Serial Console HOWTO" HREF="index.html"><LINK REL="UP" TITLE="Introduction" HREF="intro.html"><LINK REL="PREVIOUS" TITLE="Introduction" HREF="intro.html"><LINK REL="NEXT" TITLE="Why use a serial console?" HREF="intro-why.html"></HEAD ><BODY CLASS="SECTION" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Remote Serial Console HOWTO</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="intro.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 1. Introduction</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="intro-why.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECTION" ><H1 CLASS="SECTION" ><A NAME="INTRO-WHAT" ></A >1.1. What is a console?</H1 ><P >The console is the text output device for system administration messages. These messages come from the kernel, from the <SPAN CLASS="APPLICATION" >init</SPAN > system and from the system logger.</P ><P >On modern small computers the console is usually the computer's attached monitor and keyboard.</P ><P >On many older computers the console is an <SPAN CLASS="ACRONYM" >RS-232</SPAN > link to a terminal such as a <SPAN CLASS="ACRONYM" >DEC</SPAN > <SPAN CLASS="PRODUCTNAME" ><SPAN CLASS="ACRONYM" >VT100</SPAN ></SPAN >. This terminal is in a locked room and is continually observed by the minicomputer's operators. Large systems from Sun, Hewlett-Packard and <SPAN CLASS="ACRONYM" >IBM</SPAN > still use serial consoles.</P ><P >It is usually possible to login from the console. A login session from the console is treated by many parts of the operating system as being more trustworthy than a login session from other sources. Logging in as the <SPAN CLASS="SYSTEMITEM" >root</SPAN > super-user from the console is the Command Line of Last Resort when faced with a misbehaving system.</P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="intro.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="intro-why.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Introduction</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="intro.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Why use a serial console?</TD ></TR ></TABLE ></DIV ></BODY ></HTML >