1 | <sect1 id="postlfs-config-profile">
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2 | <?dbhtml filename="profile.html" dir="postlfs"?>
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3 | <title>The Bash Shell Startup Files</title>
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4 |
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5 | <para>The shell program <filename>/bin/bash</filename> (hereafter
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6 | referred to as just "the shell") uses a collection of startup files to
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7 | help create an environment to run in. Each file has a specific use and
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8 | may affect login and interactive environments differently.</para>
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9 |
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10 | <para>An interactive login shell is started after a successful login by
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11 | <filename>/bin/login</filename> by reading the /etc/passwd file. An
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12 | interactive non-login shell is started at the command line (e.g.
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13 | [prompt]$<userinput>/bin/bash</userinput>). A non-interactive shell is
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14 | usually present when a shell script is running. It is non-interactive
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15 | because it is processing a script and not waiting for user input between
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16 | commands.</para>
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17 |
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18 | <para>For more information see <filename>info bash</filename> -- Nodes:
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19 | Bash Startup Files and Interactive Shells</para>
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20 |
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21 | <para>The following files are needed to make sure that the correct
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22 | environment is read for each of the ways the shell can be invoked:
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23 | <filename>/etc/profile</filename>, <filename>/etc/bashrc</filename>,
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24 | <filename>~/.bash_profile</filename>, and
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25 | <filename>~/.bashrc</filename>. The file
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26 | <filename>~/.bash_logout</filename> is not used for an invocation of the
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27 | shell. It is read by the shell when a user logouts of the system. The
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28 | files <filename>/etc/profile</filename> and
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29 | <filename>~/.bash_profile</filename> are read when the shell is invoked
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30 | as a interactive login shell. The file <filename>~/.bashrc</filename>
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31 | is read when the shell is invoked as an interactive non-login
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32 | shell.</para>
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33 |
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34 | <para>Here is a base <filename>/etc/profile</filename>. Comments in the
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35 | file should explain everything you need. For more information on the
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36 | escape sequences you can use for your prompt (e.g. the PS1 environment
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37 | variable) see <filename>info bash</filename> -- Node: Printing a
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38 | Prompt.</para>
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39 |
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40 | <para><screen># Begin /etc/profile
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41 | # Written for Beyond Linux From Scratch
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42 | # by James Robertson <jameswrobertson@earthlink.net>
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43 |
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44 | # System wide environment variables and startup programs.
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45 |
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46 | # System wide aliases and functions should go in /etc/bashrc. Personal
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47 | # environment variables and startup programs should go into
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48 | # ~/.bash_profile. Personal aliases and functions should go into
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49 | # ~/.bashrc.
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50 |
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51 | # Function to help us manage paths
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52 | pathman () {
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53 | if ! echo $PATH | /bin/egrep -q "(^|:)$1($|:)" ; then
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54 | if [ "$2" = "last" ] ; then
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55 | PATH=$PATH:$1
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56 | else
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57 | PATH=$1:$PATH
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58 | fi
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59 | fi
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60 | }
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61 |
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62 | # Add to the standard path.
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63 | if [ $(id -u) = 0 ] ; then
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64 | if [ -d "/usr/local/sbin" ] ; then
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65 | pathman /usr/local/sbin last
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66 | fi
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67 | fi
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68 |
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69 | if [ $(id -u) != 0 ] ; then
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70 | if [ -d "/usr/local/bin" ] ; then
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71 | pathman /usr/local/bin last
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72 | fi
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73 | fi
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74 |
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75 | if [ -d "/usr/X11R6/bin" ] ; then
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76 | pathman /usr/X11R6/bin last
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77 | fi
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78 |
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79 | # Setup some environment variables.
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80 | HISTSIZE=1000
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81 | PS1="[\u@\h \w]\\$ "
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82 |
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83 | # Setup the INPUTRC environment variable.
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84 | if [ -z "$INPUTRC" -a ! -f "$HOME/.inputrc" ] ; then
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85 | INPUTRC=/etc/inputrc
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86 | fi
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87 |
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88 | # Setup for /bin/ls to support color, the alias is in /etc/bashrc.
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89 | if [ -f "/etc/dircolors" ] ; then
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90 | eval $(dircolors -b /etc/dircolors)
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91 |
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92 | if [ -f "$HOME/.dircolors" ] ; then
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93 | eval $(dircolors -b $HOME/.dircolors)
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94 | fi
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95 | fi
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96 |
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97 | export PATH HISTSIZE PS1 LS_COLORS INPUTRC
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98 |
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99 | # End /etc/profile</screen></para>
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100 |
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101 | <para>Here is a base <filename>/etc/bashrc</filename>. Comments in the
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102 | file should explain everything you need.</para>
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103 |
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104 | <para><screen># Begin /etc/bashrc
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105 | # Written for Beyond Linux From Scratch
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106 | # by James Robertson <jameswrobertson@earthlink.net>
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107 |
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108 | # System wide aliases and functions.
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109 |
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110 | # System wide environment variables and startup programs should go into
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111 | # /etc/profile. Personal environment variables and startup programs
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112 | # should go into ~/.bash_profile. Personal aliases and functions should
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113 | # go into ~/.bashrc
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114 |
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115 | # By default we want the umask to get set.
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116 | # Even for non-interactive and non-login shells.
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117 | if [ "$(id -gn)" = "$(id -un)" -a $(id -u) -gt 99 ] ; then
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118 | umask 002
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119 | else
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120 | umask 022
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121 | fi
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122 |
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123 | # Provides a colored /bin/ls command. Used in conjunction with code in
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124 | # /etc/profile.
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125 | alias ls='ls --color=auto'
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126 |
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127 | # End /etc/bashrc</screen></para>
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128 |
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129 | <para>Here is a base <filename>~/.bash_profile</filename>. Comments in
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130 | the file should explain everything you need.</para>
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131 |
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132 | <para><screen># Begin ~/.bash_profile
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133 | # Written for Beyond Linux From Scratch
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134 | # by James Robertson <jameswrobertson@earthlink.net>
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135 |
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136 | # Personal environment variables and startup programs.
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137 |
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138 | # Personal aliases and functions should go in ~/.bashrc. System wide
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139 | # environment variables and startup programs are in /etc/profile.
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140 | # System wide aliases and functions are in /etc/bashrc.
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141 |
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142 | if [ -f "$HOME/.bashrc" ] ; then
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143 | source $HOME/.bashrc
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144 | fi
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145 |
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146 | if [ -d "$HOME/bin" ] ; then
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147 | pathman $HOME/bin last
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148 | fi
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149 |
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150 | export PATH
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151 |
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152 | # End ~/.bash_profile</screen></para>
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153 |
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154 | <para>Here is a base <filename>~/.bashrc</filename>. Comments in the
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155 | file should explain everything you need.</para>
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156 |
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157 | <para><screen># Begin ~/.bashrc
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158 | # Written for Beyond Linux From Scratch
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159 | # by James Robertson <jameswrobertson@earthlink.net>
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160 |
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161 | # Personal aliases and functions.
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162 |
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163 | # Personal environment variables and startup programs should go in
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164 | # ~/.bash_profile. System wide environment variables and startup
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165 | # programs are in /etc/profile. System wide aliases and functions are
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166 | # in /etc/bashrc.
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167 |
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168 | if [ -f "/etc/bashrc" ] ; then
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169 | source /etc/bashrc
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170 | fi
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171 |
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172 | # End ~/.bashrc</screen></para>
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173 |
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174 | <para>Here is a base <filename>~/.bash_logout</filename>. Comments in
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175 | the file should explain everything you need. You will notice that the
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176 | base <filename>~/.bash_logout</filename> does not include a
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177 | <userinput>clear</userinput> command. This is because the clear is
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178 | handled in the <filename>/etc/issue</filename> file.</para>
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179 |
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180 | <para><screen># Begin ~/.bash_logout
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181 | # Written for Beyond Linux From Scratch
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182 | # by James Robertson <jameswrobertson@earthlink.net>
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183 |
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184 | # Personal items to perform on logout.
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185 |
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186 | # End ~/.bash_logout</screen></para>
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187 |
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188 | <para>If you want to use the <filename>/etc/dircolors</filename> or
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189 | <filename>~/.dircolors</filename> files called from
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190 | <filename>/etc/profile</filename>, then run the following:
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191 | <userinput>/bin/dircolors -p > /etc/dircolors</userinput> or
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192 | <userinput>/bin/dircolors -p > ~/.dircolors</userinput> respectively.
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193 | The file in the <filename>/etc</filename> directory should be used for
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194 | global settings and if one exists in your home directory then it will
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195 | overwrite the global settings. It might be a good idea to create a base
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196 | <filename>.dircolors</filename> file and place it in the
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197 | <filename>/etc/skel</filename> directory for new users.</para>
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198 |
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199 | <para>Ian Macdonald has written an excellent collection of tips and
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200 | tricks to enhance your shell environment. You can read it online at
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201 | <ulink
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202 | url="http://www.caliban.org/bash/index.shtml">http://www.caliban.org/bash/index.shtml</ulink></para>
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203 |
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204 | </sect1>
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