Improve a warning about non-portable "mv" usage.

* doc/coreutils.texi (mv invocation): Adjust the warning: moving a
dir-symlink-specified-with-a-trailing-slash works in a surprising
manner only on some systems.  Reported by Tomas Pospisek in
http://bugs.debian.org/343652.

1 files changed, 8 insertions, 4 deletions

diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index 3785eae9f..0de856089 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -7773,10 +7773,14 @@ is a terminal, and the @option{-f} or @option{--force} option is not given,
 own the file, or have write permission on its directory.)  If the
 response is not affirmative, the file is skipped.
 
-@emph{Warning}: If you try to move a symlink that points to a directory,
-and you specify the symlink with a trailing slash, then @command{mv}
-doesn't move the symlink but instead moves the directory referenced
-by the symlink.  @xref{Trailing slashes}.
+@emph{Warning}: Avoid specifying a source name with a trailing slash,
+when it might be a symlink to a directory.
+Otherwise, @command{mv} may do something very surprising, since
+its behavior depends on the underlying rename system call.
+On modern Linux systems, it fails with @code{errno=ENOTDIR}.
+However, on other systems (at least FreeBSD 6.1 and Solaris 10) it silently
+renames not the symlink but rather the directory referenced by the symlink.
+@xref{Trailing slashes}.
 
 The program accepts the following options.  Also see @ref{Common options}.