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* textbinary.sgml: Remove tr example and just mention u2d and d2u instead.

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Christopher Faylor 2010-03-27 05:26:51 +00:00
parent 86a58929ba
commit cf989df66a
2 changed files with 9 additions and 35 deletions
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5
winsup/doc/ChangeLog
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@ -1,3 +1,8 @@
2010-03-27 Christopher Faylor <me+cygwin@cgf.cx>
* textbinary.sgml: Remove tr example and just mention u2d and d2u
instead.
2010-03-25 Christopher Faylor <me+cygwin@cgf.cx> 2010-03-25 Christopher Faylor <me+cygwin@cgf.cx>
* pathnames.sgml: Clarify wording of user-specific fstab files. Fix * pathnames.sgml: Clarify wording of user-specific fstab files. Fix

39
winsup/doc/textbinary.sgml
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@ -68,45 +68,14 @@ Non-Cygwin shells always pipe and redirect with binary mode. With
non-Cygwin shells the commands <command> cat filename | program </command> non-Cygwin shells the commands <command> cat filename | program </command>
and <command> program &lt; filename </command> are not equivalent when and <command> program &lt; filename </command> are not equivalent when
<filename>filename</filename> is on a text-mounted partition. </para> <filename>filename</filename> is on a text-mounted partition. </para>
<para>The programs <command>u2d</command> and <command>d2u</command> can
be used to add or remove CR's from a file. <command>u2d</command> add's CR's before a NL.
<command>d2u</command> removes CR's. Use the --help option to these commands
for more information.
</listitem> </listitem>
</orderedlist> </orderedlist>
</sect2> </sect2>
<sect2 id="textbin-example"><title>Example</title>
<para>To illustrate the various rules, we provide scripts to delete CRs
from files by using the <command>tr</command> program, which can only write
to standard output.
The script</para>
<screen>
<![CDATA[
#!/bin/sh
# Remove \r from the file given as argument
tr -d '\r' < "$1" > "$1".nocr
]]>
</screen>
<para> will not work on a text mounted systems because the \r will be
reintroduced on writing. However scripts such as </para>
<screen>
<![CDATA[
#!/bin/sh
# Remove \r from the file given as argument
tr -d '\r' | gzip | gunzip > "$1".nocr
]]>
</screen>
<para>and the .bat file</para>
<screen>
<![CDATA[
REM Remove \r from the file given as argument
@echo off
tr -d \r < %1 > %1.nocr
]]>
</screen>
<para> work fine. In the first case we rely on <command>gunzip</command> to
set its output to binary mode, possibly overriding the mode used by the shell.
In the second case we rely on the DOS shell to redirect in binary mode.
</para>
</sect2>
<sect2 id="textbin-question"><title>Binary or text?</title> <sect2 id="textbin-question"><title>Binary or text?</title>
<para>UNIX programs that have been written for maximum portability <para>UNIX programs that have been written for maximum portability