[f8d632ac] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[6732c094] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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[f8d632ac] | 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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[0290a023] | 8 | <sect1 id="postlfs-config-logon" xreflabel="Customizing your Logon with /etc/issue">
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[89acbff] | 9 | <?dbhtml filename="logon.html"?>
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[f45b1953] | 10 |
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[89acbff] | 11 | <sect1info>
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| 12 | <othername>$LastChangedBy$</othername>
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| 13 | <date>$Date$</date>
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| 14 | </sect1info>
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[f45b1953] | 15 |
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[89acbff] | 16 | <title>Customizing your Logon with /etc/issue</title>
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[f45b1953] | 17 |
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[89acbff] | 18 | <indexterm zone="postlfs-config-logon">
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| 19 | <primary sortas="e-etc-issue">/etc/issue</primary>
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| 20 | </indexterm>
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[f45b1953] | 21 |
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[e0d33ef] | 22 | <para>When you first boot up your new LFS system, the logon screen will
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| 23 | be nice and plain (as it should be in a bare-bones system). Many people
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| 24 | however, will want their system to display some information in the logon
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| 25 | message. This can be accomplished using the
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[89acbff] | 26 | file <filename>/etc/issue</filename>.</para>
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[f45b1953] | 27 |
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[89acbff] | 28 | <para>The <filename>/etc/issue</filename> file is a plain text file
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[615b431] | 29 | which will also accept certain escape sequences (see below) in order to
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[89acbff] | 30 | insert information about the system. There is also the file
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[bbdb0ff4] | 31 | <filename>issue.net</filename> which can be used when logging on remotely.
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[e0d33ef] | 32 | <command>ssh</command> however, will only use it if you set the option in the
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[615b431] | 33 | configuration file and will <emphasis>not</emphasis> interpret the
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[89acbff] | 34 | escape sequences shown below.</para>
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[f45b1953] | 35 |
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[754c0de] | 36 | <para>One of the most common things which people want to do is clear the
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| 37 | screen at each logon. The easiest way of doing that is to put a "clear"
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| 38 | escape sequence into <filename>/etc/issue</filename>. A simple way of doing
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| 39 | this is to issue the command <command>clear > /etc/issue</command>. This
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| 40 | will insert the relevant escape code into the start of the
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[e0d33ef] | 41 | <filename>/etc/issue</filename> file. Note that if you do this, when you
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[754c0de] | 42 | edit the file, you should leave the characters (normally '^[[H^[[2J') on the
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| 43 | first line alone.</para>
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[bccbdaea] | 44 |
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[754c0de] | 45 | <note><para>Terminal escape sequences are special codes recognized by the
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| 46 | terminal. The ^[ represents an ASCII ESC character. The sequence ESC [ H
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| 47 | puts the cursor in the upper left hand corner of the screen and ESC 2 J
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| 48 | erases the screen. For more information on terminal escape sequences see
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| 49 | <ulink url='http://rtfm.etla.org/xterm/ctlseq.html'/></para></note>
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[89acbff] | 50 |
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[754c0de] | 51 | <para>The following sequences are recognized by <command>agetty</command>
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[e0d33ef] | 52 | (the program which usually parses <filename>/etc/issue</filename>). This
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| 53 | information is from <command>man agetty</command> where you can find
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[89acbff] | 54 | extra information about the logon process.</para>
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| 55 |
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[754c0de] | 56 | <para>The <filename>issue</filename> file can contain certain character
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| 57 | sequences to display various information. All <filename>issue</filename>
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| 58 | sequences consist of a backslash (\) immediately followed by one of the
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| 59 | letters explained below (so <option>\d</option> in
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| 60 | <filename>/etc/issue</filename> would insert the current date).</para>
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[89acbff] | 61 |
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| 62 | <screen><literal>b Insert the baudrate of the current line.
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[f45b1953] | 63 | d Insert the current date.
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| 64 | s Insert the system name, the name of the operating system.
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| 65 | l Insert the name of the current tty line.
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[615b431] | 66 | m Insert the architecture identifier of the machine, e.g., i686.
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[f45b1953] | 67 | n Insert the nodename of the machine, also known as the hostname.
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| 68 | o Insert the domainname of the machine.
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[615b431] | 69 | r Insert the release number of the kernel, e.g., 2.6.11.12.
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[f45b1953] | 70 | t Insert the current time.
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| 71 | u Insert the number of current users logged in.
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| 72 | U Insert the string "1 user" or "<n> users" where <n> is the
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| 73 | number of current users logged in.
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[89acbff] | 74 | v Insert the version of the OS, e.g., the build-date etc.</literal></screen>
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[f45b1953] | 75 |
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| 76 | </sect1>
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