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diff --git a/octave_packages/m/prefs/private/prefsfile.m b/octave_packages/m/prefs/private/prefsfile.m
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+## Copyright (C) 2012 John W. Eaton
+##
+## This file is part of Octave.
+##
+## Octave 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 3 of the License, or (at
+## your option) any later version.
+##
+## Octave 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 Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} prefsfile ()
+## Undocumented internal function.
+## @end deftypefn
+
+## Author: jwe
+
+function retval = prefsfile ()
+
+  retval = "~/.octave_prefs";
+
+  ## Transition users to new filename if necessary
+  ## FIXME: Delete before 3.6.0 release
+  oldname = tilde_expand ("~/.octave-prefs");
+  if (exist (oldname, "file"))
+    newname = tilde_expand (retval); 
+    if (exist (newname, "file"))
+      error (["Octave uses the file ~/.octave_prefs to store preferences.\n",...
+              "       The old file name was ~/.octave-prefs.\n",...
+              "       Both files exist."...
+              "  User must manually delete one of the files.\n"]);
+    endif
+    status = movefile (oldname, newname);
+    if (! status)
+      error (["Octave uses the file ~/.octave_prefs to store preferences.\n",
+             "        The old file name was ~/.octave-prefs.\n",
+             "        User must manually rename the old file to the new name.\n"]);
+    endif
+  endif
+
+endfunction
+
+%% Testing these functions will require some care to avoid wiping out
+%% existing (or creating unwanted) preferences for the user running the
+%% tests.