[SCM] GNU Autoconf source repository branch, master, updated. v2.68b-10-g5046bf6

[Paul Eggert]

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- Log -----------------------------------------------------------------
commit 5046bf6ee6d1d33373434db07ba18da4ad293f1a
Author: Paul Eggert <address@hidden>
Date:   Sun Mar 4 09:49:27 2012 -0800

    doc: mention PATH bug with "ksh foo"
    
    * doc/autoconf.texi (Invoking the Shell): Mention ksh PATH bug.

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

Summary of changes:
 doc/autoconf.texi |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index da34a4e..9442e22 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -15219,6 +15219,22 @@ Bash in Mac OS X 10.2.
 @cindex invoking the shell
 @cindex shell invocation
 
+The Korn shell (up to at least version M-12/28/93d) has a bug when
+invoked on a file whose name does not contain a slash.  It first
+searches for the file's name in @env{PATH}, and if found it executes
+that rather than the original file.  For example, assuming there is a
+binary executable @file{/usr/bin/script} in your @env{PATH}, the last
+command in the following example fails because the Korn shell finds
address@hidden/usr/bin/script} and refuses to execute it as a shell script:
+
address@hidden
+$ @kbd{touch xxyzzyz script}
+$ @kbd{ksh xxyzzyz}
+$ @kbd{ksh ./script}
+$ @kbd{ksh script}
+ksh: script: cannot execute
address@hidden example
+
 Bash 2.03 has a bug when invoked with the @option{-c} option: if the
 option-argument ends in backslash-newline, Bash incorrectly reports a
 syntax error.  The problem does not occur if a character follows the


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