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howto-html-en-20080722-2mdv2010.1.noarch.rpm

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>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
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