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[SCM] GNU Autoconf source repository branch, master, updated. v2.65-61-g
From: |
Eric Blake |
Subject: |
[SCM] GNU Autoconf source repository branch, master, updated. v2.65-61-ga7902d0 |
Date: |
Mon, 26 Apr 2010 15:35:23 +0000 |
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- Log -----------------------------------------------------------------
commit a7902d0d7ff638caf59a42c0aa923b448ce42fea
Author: Eric Blake <address@hidden>
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 <address@hidden>
-----------------------------------------------------------------------
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 <address@hidden>
+
+ 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 <address@hidden> (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
address@hidden 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
address@hidden 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
$ @address@hidden echo moon; echo light; @} | /usr/ucb/tr -d '\n' ; echo}
@@ -18409,6 +18412,9 @@ $ @address@hidden echo moon; echo light; @} |
/usr/bin/tr -d '\n' ; echo}
moonlight
$ @address@hidden echo moon; echo light; @} | /usr/ucb/tr -d '\012' ; echo}
moonlight
+$ @kbd{nl='}
address@hidden'; @{ echo moon; echo light; @} | /usr/ucb/tr -d "$nl" ; echo}
+moonlight
@end example
Not all versions of @command{tr} recognize ranges of characters: at
hooks/post-receive
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