[ab4fdfc] | 1 | <?xml version="1.0" encoding="UTF-8"?>
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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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| 11 |
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[89acbff] | 12 | <title>Customizing your Logon with /etc/issue</title>
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[f45b1953] | 13 |
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[89acbff] | 14 | <indexterm zone="postlfs-config-logon">
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| 15 | <primary sortas="e-etc-issue">/etc/issue</primary>
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| 16 | </indexterm>
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[f45b1953] | 17 |
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[81a73ed8] | 18 | <para>
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| 19 | When you first boot up your new LFS system, the logon screen will be
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| 20 | nice and plain (as it should be in a bare-bones system). Many people
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| 21 | however, will want their system to display some information in the logon
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| 22 | message. This can be accomplished using the
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| 23 | file <filename>/etc/issue</filename>.
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| 24 | </para>
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[f45b1953] | 25 |
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[81a73ed8] | 26 | <para>
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| 27 | The <filename>/etc/issue</filename> file is a plain text file
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| 28 | which will also accept certain escape sequences (see below) in order to
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| 29 | insert information about the system. There is also the file
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| 30 | <filename>issue.net</filename> which can be used when logging on remotely.
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| 31 | <command>ssh</command> however, will only use it if you set the option in
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| 32 | the configuration file and will <emphasis>not</emphasis> interpret the
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| 33 | escape sequences shown below.
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| 34 | </para>
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[f45b1953] | 35 |
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[81a73ed8] | 36 | <para>
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| 37 | One of the most common things which people want to do is clear the
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| 38 | screen at each logon. The easiest way of doing that is to put a "clear"
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| 39 | escape sequence into <filename>/etc/issue</filename>. A simple way of
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| 40 | doing this is to issue the command <command>clear >
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| 41 | /etc/issue</command>. This will insert the relevant escape code into
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| 42 | the start of the <filename>/etc/issue</filename> file. Note that if
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| 43 | you do this, when you edit the file, you should leave the characters
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| 44 | (normally '^[[H^[[2J') on the first line alone.
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| 45 | </para>
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[bccbdaea] | 46 |
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[81a73ed8] | 47 | <note>
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| 48 | <para>
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| 49 | Terminal escape sequences are special codes recognized by the terminal.
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| 50 | The ^[ represents an ASCII ESC character. The sequence ESC [ H
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| 51 | puts the cursor in the upper left hand corner of the screen and ESC 2 J
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| 52 | erases the screen. For more information on terminal escape sequences see
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[497d485] | 53 | <ulink url='https://invisible-mirror.net/xterm/ctlseqs/ctlseqs.html'/>
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[81a73ed8] | 54 | </para>
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| 55 | </note>
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[89acbff] | 56 |
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[81a73ed8] | 57 | <para>
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| 58 | The following sequences are recognized by <command>agetty</command>
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| 59 | (the program which usually parses <filename>/etc/issue</filename>). This
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| 60 | information is from <command>man agetty</command> where you can find
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| 61 | extra information about the logon process.
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| 62 | </para>
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[89acbff] | 63 |
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[81a73ed8] | 64 | <para>
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| 65 | The <filename>issue</filename> file can contain certain character
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| 66 | sequences to display various information. All <filename>issue</filename>
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| 67 | sequences consist of a backslash (\) immediately followed by one of the
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| 68 | letters explained below (so <option>\d</option> in
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| 69 | <filename>/etc/issue</filename> would insert the current date).
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| 70 | </para>
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[89acbff] | 71 |
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| 72 | <screen><literal>b Insert the baudrate of the current line.
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[f45b1953] | 73 | d Insert the current date.
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| 74 | s Insert the system name, the name of the operating system.
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| 75 | l Insert the name of the current tty line.
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[615b431] | 76 | m Insert the architecture identifier of the machine, e.g., i686.
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[f45b1953] | 77 | n Insert the nodename of the machine, also known as the hostname.
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| 78 | o Insert the domainname of the machine.
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[615b431] | 79 | r Insert the release number of the kernel, e.g., 2.6.11.12.
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[f45b1953] | 80 | t Insert the current time.
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| 81 | u Insert the number of current users logged in.
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| 82 | U Insert the string "1 user" or "<n> users" where <n> is the
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| 83 | number of current users logged in.
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[89acbff] | 84 | v Insert the version of the OS, e.g., the build-date etc.</literal></screen>
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[f45b1953] | 85 |
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| 86 | </sect1>
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