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90 lines
3.7 KiB
XML
90 lines
3.7 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../../general.ent">
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%general-entities;
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]>
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<sect1 id="postlfs-config-logon" xreflabel="Customizing your Logon with /etc/issue">
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<?dbhtml filename="logon.html"?>
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<sect1info>
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<date>$Date$</date>
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</sect1info>
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<title>Customizing your Logon with /etc/issue</title>
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<indexterm zone="postlfs-config-logon">
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<primary sortas="e-etc-issue">/etc/issue</primary>
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</indexterm>
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<para>
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When you first boot up your new LFS system, the logon screen will be
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nice and plain (as it should be in a bare-bones system). Many people
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however, will want their system to display some information in the logon
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message. This can be accomplished using the
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file <filename>/etc/issue</filename>.
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</para>
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<para>
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The <filename>/etc/issue</filename> file is a plain text file
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which will also accept certain escape sequences (see below) in order to
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insert information about the system. There is also the file
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<filename>issue.net</filename> which can be used when logging on remotely.
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<command>ssh</command> however, will only use it if you set the option in
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the configuration file and will <emphasis>not</emphasis> interpret the
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escape sequences shown below.
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</para>
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<para>
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One of the most common things which people want to do is clear the
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screen at each logon. The easiest way of doing that is to put a "clear"
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escape sequence into <filename>/etc/issue</filename>. A simple way of
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doing this is to issue the command <command>clear >
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/etc/issue</command>. This will insert the relevant escape code into
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the start of the <filename>/etc/issue</filename> file. Note that if
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you do this, when you edit the file, you should leave the characters
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(normally '^[[H^[[2J') on the first line alone.
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</para>
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<note>
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<para>
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Terminal escape sequences are special codes recognized by the terminal.
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The ^[ represents an ASCII ESC character. The sequence ESC [ H
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puts the cursor in the upper left hand corner of the screen and ESC 2 J
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erases the screen. For more information on terminal escape sequences see
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<ulink url='http://rtfm.etla.org/xterm/ctlseq.html'/>
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</para>
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</note>
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<para>
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The following sequences are recognized by <command>agetty</command>
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(the program which usually parses <filename>/etc/issue</filename>). This
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information is from <command>man agetty</command> where you can find
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extra information about the logon process.
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</para>
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<para>
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The <filename>issue</filename> file can contain certain character
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sequences to display various information. All <filename>issue</filename>
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sequences consist of a backslash (\) immediately followed by one of the
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letters explained below (so <option>\d</option> in
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<filename>/etc/issue</filename> would insert the current date).
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</para>
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<screen><literal>b Insert the baudrate of the current line.
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d Insert the current date.
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s Insert the system name, the name of the operating system.
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l Insert the name of the current tty line.
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m Insert the architecture identifier of the machine, e.g., i686.
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n Insert the nodename of the machine, also known as the hostname.
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o Insert the domainname of the machine.
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r Insert the release number of the kernel, e.g., 2.6.11.12.
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t Insert the current time.
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u Insert the number of current users logged in.
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U Insert the string "1 user" or "<n> users" where <n> is the
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number of current users logged in.
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v Insert the version of the OS, e.g., the build-date etc.</literal></screen>
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</sect1>
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