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+#!/bin/sh
+# This is just for the record.
+# This test is not run.
+
+# Copyright (C) 2003 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+
+exit 0
+
+cat <<\EOF
+
+Prior to 5.0.91, ...
+
+The problem:
+  On a VFAT file system with coreutils-5.0.90, `mv FOO foo' removes the
+  sole copy of the file named by both the source and destination arguments.
+
+Demonstrate the problem, as root:
+
+cd /tmp                                    \
+  && dd if=/dev/zero of=1 bs=8192 count=50 \
+  && mkdir mnt && mkfs -t vfat 1           \
+  && mount -oloop 1 mnt && cd mnt          \
+  && printf something important > foo      \
+  && mv foo FOO
+test -f FOO && echo PASS-1 || echo FAIL-1
+ln foo bar
+mv foo FOO
+test -f FOO && echo PASS-2 || echo FAIL-2
+
+And in case you actually do the above, you can do this to clean up:
+
+  cd /tmp && umount /tmp/mnt && rm -r 1 mnt
+
+Hey!  Can't create hard links on vfat.
+The above `ln' evokes an `operation not permitted' failure.
+
+This demonstrates the same thing with file system type `umsdos'
+No hard links:
+
+cd /tmp                                    \
+  && dd if=/dev/zero of=1 bs=8192 count=50 \
+  && mkdir mnt && mkfs -t msdos 1          \
+  && mount -t umsdos -oloop 1 mnt && cd mnt \
+  && printf something important > foo      \
+  && mv foo FOO
+test -f FOO && echo PASS-1 || echo FAIL-1
+ln foo bar
+mv foo FOO
+test -f FOO && echo PASS-2 || echo FAIL-2
+
+EOF