From: Eric Blake <ebb9@byu.net>
Date: Wed, 14 May 2008 19:41:18 +0000 (-0600)
Subject: Improve documentation of ! issues.
X-Git-Tag: v2.63~80
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=95dfc197494a66dc9a88577d18f1633afc7cff2d;p=thirdparty%2Fautoconf.git

Improve documentation of ! issues.

* doc/autoconf.texi (Limitations of Builtins) <!>: Touch up.
Reported by Noah Misch.

Signed-off-by: Eric Blake <ebb9@byu.net>
---

diff --git a/ChangeLog b/ChangeLog
index 3782a5b55..15adde0e7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2008-05-14  Eric Blake  <ebb9@byu.net>
 
+	Improve documentation of ! issues.
+	* doc/autoconf.texi (Limitations of Builtins) <!>: Touch up.
+	Reported by Noah Misch.
+
 	Document some FreeBSD shell bugs.
 	* doc/autoconf.texi (Limitations of Builtins) <!>: Mention ! issue
 	in compound pipe commands.
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index fd60b7bd5..ee1ede5c8 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -13776,13 +13776,19 @@ The Unix version 7 shell did not support
 negating the exit status of commands with @command{!}, and this feature
 is still absent from some shells (e.g., Solaris @command{/bin/sh}).
 Other shells, such as FreeBSD @command{/bin/sh} or @command{ash}, have
-bugs when using @command{!} in compound commands:
+bugs when using @command{!}:
 
 @example
-$ @kbd{sh -c 'true && ! true | true; echo $?'}
+$ @kbd{sh -c '! : | :'; echo $?}
 1
-$ @kbd{ash -c 'true && ! true | true; echo $?'}
+$ @kbd{ash -c '! : | :'; echo $?}
 0
+$ @kbd{sh -c '! @{ :; @}'; echo $?}
+1
+$ @kbd{ash -c '! @{ :; @}'; echo $?}
+@{: not found
+Syntax error: "@}" unexpected
+2
 @end example
 
 Shell code like this: