1 | <?xml version="1.0" encoding="UTF-8"?>
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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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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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8 | <sect1 id="postlfs-config-logon" xreflabel="Customizing your Logon with /etc/issue">
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9 | <?dbhtml filename="logon.html"?>
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10 |
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11 |
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12 | <title>Customizing your Logon with /etc/issue</title>
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13 |
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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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17 |
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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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25 |
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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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35 |
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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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46 |
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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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53 | <ulink url='https://invisible-mirror.net/xterm/ctlseqs/ctlseqs.html'/>
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54 | </para>
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55 | </note>
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56 |
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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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63 |
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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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71 |
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72 | <screen><literal>b Insert the baudrate of the current line.
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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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76 | m Insert the architecture identifier of the machine, e.g., i686.
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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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79 | r Insert the release number of the kernel, e.g., 2.6.11.12.
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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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84 | v Insert the version of the OS, e.g., the build-date etc.</literal></screen>
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85 |
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86 | </sect1>
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