[SCM] GNU Autoconf source repository branch, master, updated. v2.65-61-ga7902d0

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- Log -----------------------------------------------------------------
commit a7902d0d7ff638caf59a42c0aa923b448ce42fea
Author: Eric Blake <[email protected]>
Date:   Mon Apr 26 09:30:06 2010 -0600

    Clarify octal escapes with tr.
    
    * doc/autoconf.texi (Limitations of Usual Tools): Carriage return
    is portable in octal, but not newline.
    
    Signed-off-by: Eric Blake <[email protected]>

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog         |    6 ++++++
 doc/autoconf.texi |   12 +++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index d301e6b..85d2b11 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2010-04-26  Eric Blake  <[email protected]>
+
+	Clarify octal escapes with tr.
+	* doc/autoconf.texi (Limitations of Usual Tools): Carriage return
+	is portable in octal, but not newline.
+
 2010-04-22  Joel James Adamson  <[email protected]>  (tiny change)
 
 	Add a paragraph to FAQ on Debugging configure scripts.
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 1ffaeab..fa6015f 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -18393,13 +18393,16 @@ However, these problems are no longer of practical concern.
 @c ---------------
 @prindex @command{tr}
 @cindex carriage return, deleting
+@cindex newline, deleting
 @cindex deleting carriage return
 Not all versions of @command{tr} handle all backslash character escapes.
 For example, Solaris 10 @command{/usr/ucb/tr} falls over, even though
 Solaris contains more modern @command{tr} in other locations.
-Therefore, it is more portable to use octal escapes, even though this
-ties the result to ASCII, when using @command{tr} to delete
-newlines or carriage returns.
+Using octal escapes is more portable for carriage returns, since
+@samp{\015} is the same for both ASCII and EBCDIC, and since use of
+literal carriage returns in scripts causes a number of other problems.
+But for other characters, like newline, using octal escapes ties the
+operation to ASCII, so it is better to use literal characters.
 
 @example
 $ @kbd{@{ echo moon; echo light; @} | /usr/ucb/tr -d '\n' ; echo}
@@ -18409,6 +18412,9 @@ $ @kbd{@{ echo moon; echo light; @} | /usr/bin/tr -d '\n' ; echo}
 moonlight
 $ @kbd{@{ echo moon; echo light; @} | /usr/ucb/tr -d '\012' ; echo}
 moonlight
+$ @kbd{nl='}
+@kbd{'; @{ echo moon; echo light; @} | /usr/ucb/tr -d "$nl" ; echo}
+moonlight
 @end example
 
 Not all versions of @command{tr} recognize ranges of characters: at


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