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authorBruce Dubbs <bdubbs@linuxfromscratch.org>2020-06-07 20:16:00 +0000
committerBruce Dubbs <bdubbs@linuxfromscratch.org>2020-06-07 20:16:00 +0000
commitfcc027677da55c41dcaea045f5b9ff8b088e6495 (patch)
tree42500a7858959695b971e7f28f1d0bf33185db2e /chapter07/profile.xml
parentd53fefab5a6772fef606392a61608fc290e6a7ae (diff)
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git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/cross2@11897 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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-<?xml version="1.0" encoding="ISO-8859-1"?>
-<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
- <!ENTITY % general-entities SYSTEM "../general.ent">
- %general-entities;
-]>
-
-<sect1 id="ch-config-profile" revision="sysv">
- <?dbhtml filename="profile.html"?>
-
- <title>The Bash Shell Startup Files</title>
-
- <indexterm zone="ch-config-profile">
- <primary sortas="e-/etc/profile">/etc/profile</primary>
- </indexterm>
-
- <para>The shell program <command>/bin/bash</command> (hereafter referred to
- as <quote>the shell</quote>) uses a collection of startup files to help
- create an environment to run in. Each file has a specific use and may affect
- login and interactive environments differently. The files in the <filename
- class="directory">/etc</filename> directory provide global settings. If an
- equivalent file exists in the home directory, it may override the global
- settings.</para>
-
- <para>An interactive login shell is started after a successful login, using
- <command>/bin/login</command>, by reading the <filename>/etc/passwd</filename>
- file. An interactive non-login shell is started at the command-line (e.g.,
- <prompt>[prompt]$</prompt><command>/bin/bash</command>). A non-interactive
- shell is usually present when a shell script is running. It is non-interactive
- because it is processing a script and not waiting for user input between
- commands.</para>
-
- <para>For more information, see <command>info bash</command> under the
- <emphasis>Bash Startup Files and Interactive Shells</emphasis> section.</para>
-
- <para>The files <filename>/etc/profile</filename> and
- <filename>~/.bash_profile</filename> are read when the shell is
- invoked as an interactive login shell.</para>
-
- <para>The base <filename>/etc/profile</filename> below sets some
- environment variables necessary for native language support. Setting
- them properly results in:</para>
-
- <itemizedlist>
- <listitem>
- <para>The output of programs translated into the native language</para>
- </listitem>
- <listitem>
- <para>Correct classification of characters into letters, digits and other
- classes. This is necessary for <command>bash</command> to properly accept
- non-ASCII characters in command lines in non-English locales</para>
- </listitem>
- <listitem>
- <para>The correct alphabetical sorting order for the country</para>
- </listitem>
- <listitem>
- <para>Appropriate default paper size</para>
- </listitem>
- <listitem>
- <para>Correct formatting of monetary, time, and date values</para>
- </listitem>
- </itemizedlist>
-
- <para>Replace <replaceable>&lt;ll&gt;</replaceable> below with the two-letter code
- for the desired language (e.g., <quote>en</quote>) and
- <replaceable>&lt;CC&gt;</replaceable> with the two-letter code for the appropriate
- country (e.g., <quote>GB</quote>). <replaceable>&lt;charmap&gt;</replaceable> should
- be replaced with the canonical charmap for your chosen locale. Optional
- modifiers such as <quote>@euro</quote> may also be present.</para>
-
- <para>The list of all locales supported by Glibc can be obtained by running
- the following command:</para>
-
-<screen role="nodump"><userinput>locale -a</userinput></screen>
-
- <para>Charmaps can have a number of aliases, e.g., <quote>ISO-8859-1</quote>
- is also referred to as <quote>iso8859-1</quote> and <quote>iso88591</quote>.
- Some applications cannot handle the various synonyms correctly (e.g., require
- that <quote>UTF-8</quote> is written as <quote>UTF-8</quote>, not
- <quote>utf8</quote>), so it is safest in most
- cases to choose the canonical name for a particular locale. To determine
- the canonical name, run the following command, where <replaceable>&lt;locale
- name&gt;</replaceable> is the output given by <command>locale -a</command> for
- your preferred locale (<quote>en_GB.iso88591</quote> in our example).</para>
-
-<screen role="nodump"><userinput>LC_ALL=<replaceable>&lt;locale name&gt;</replaceable> locale charmap</userinput></screen>
-
- <para>For the <quote>en_GB.iso88591</quote> locale, the above command
- will print:</para>
-
-<screen><computeroutput>ISO-8859-1</computeroutput></screen>
-
- <para>This results in a final locale setting of <quote>en_GB.ISO-8859-1</quote>.
- It is important that the locale found using the heuristic above is tested prior
- to it being added to the Bash startup files:</para>
-
-<screen role="nodump"><userinput>LC_ALL=&lt;locale name&gt; locale language
-LC_ALL=&lt;locale name&gt; locale charmap
-LC_ALL=&lt;locale name&gt; locale int_curr_symbol
-LC_ALL=&lt;locale name&gt; locale int_prefix</userinput></screen>
-
- <para>The above commands should print the language name, the character
- encoding used by the locale, the local currency, and the prefix to dial
- before the telephone number in order to get into the country. If any of the
- commands above fail with a message similar to the one shown below, this means
- that your locale was either not installed in Chapter&nbsp;6 or is not supported by
- the default installation of Glibc.</para>
-
-<screen><computeroutput>locale: Cannot set LC_* to default locale: No such file or directory</computeroutput></screen>
-
- <para>If this happens, you should either install the desired locale using the
- <command>localedef</command> command, or consider choosing a different locale.
- Further instructions assume that there are no such error messages from
- Glibc.</para>
-
- <!-- FIXME: the xlib example will became obsolete real soon -->
- <para>Some packages beyond LFS may also lack support for your chosen locale. One
- example is the X library (part of the X Window System), which outputs the
- following error message if the locale does not exactly match one of the character
- map names in its internal files:</para>
-
-<screen><computeroutput>Warning: locale not supported by Xlib, locale set to C</computeroutput></screen>
-
- <para>In several cases Xlib expects that the character map will be listed in
- uppercase notation with canonical dashes. For instance, "ISO-8859-1" rather
- than "iso88591". It is also possible to find an appropriate specification by
- removing the charmap part of the locale specification. This can be checked
- by running the <command>locale charmap</command> command in both locales.
- For example, one would have to change "de_DE.ISO-8859-15@euro" to
- "de_DE@euro" in order to get this locale recognized by Xlib.</para>
-
- <para>Other packages can also function incorrectly (but may not necessarily
- display any error messages) if the locale name does not meet their expectations.
- In those cases, investigating how other Linux distributions support your locale
- might provide some useful information.</para>
-
- <para>Once the proper locale settings have been determined, create the
- <filename>/etc/profile</filename> file:</para>
-
-<screen><userinput>cat &gt; /etc/profile &lt;&lt; "EOF"
-<literal># Begin /etc/profile
-
-export LANG=<replaceable>&lt;ll&gt;_&lt;CC&gt;.&lt;charmap&gt;&lt;@modifiers&gt;</replaceable>
-
-# End /etc/profile</literal>
-EOF</userinput></screen>
-
- <para>The <quote>C</quote> (default) and <quote>en_US</quote> (the recommended
- one for United States English users) locales are different. <quote>C</quote>
- uses the US-ASCII 7-bit character set, and treats bytes with the high bit set
- as invalid characters. That's why, e.g., the <command>ls</command> command
- substitutes them with question marks in that locale. Also, an attempt to send
- mail with such characters from Mutt or Pine results in non-RFC-conforming
- messages being sent (the charset in the outgoing mail is indicated as <quote>unknown
- 8-bit</quote>). So you can use the <quote>C</quote> locale only if you are sure that
- you will never need 8-bit characters.</para>
-
- <para>UTF-8 based locales are not supported well by some programs.
- Work is in progress to document and, if possible, fix such problems, see
- <ulink url="&blfs-book;introduction/locale-issues.html"/>.</para>
-
-</sect1>