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diff --git a/octave_packages/m/miscellaneous/unix.m b/octave_packages/m/miscellaneous/unix.m
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+## Copyright (C) 2004-2012 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} {} unix ("@var{command}")
+## @deftypefnx {Function File} {@var{status} =} unix ("@var{command}")
+## @deftypefnx {Function File} {[@var{status}, @var{text}] =} unix ("@var{command}")
+## @deftypefnx {Function File} {[@dots{}] =} unix ("@var{command}", "-echo")
+## Execute a system command if running under a Unix-like operating
+## system, otherwise do nothing.  Return the exit status of the program
+## in @var{status} and any output from the command in @var{text}.
+## When called with no output argument, or the "-echo" argument is
+## given, then @var{text} is also sent to standard output.
+## @seealso{dos, system, isunix, ispc}
+## @end deftypefn
+
+## Author: octave-forge ???
+## Adapted by: jwe
+
+function [status, text] = unix (command, echo_arg)
+
+  if (nargin < 1 || nargin > 2)
+    print_usage ();
+  elseif (isunix ())
+    [status, text] = system (command);
+    if (nargin > 1 || nargout == 0)
+      printf ("%s\n", text);
+    endif
+  endif
+
+endfunction
+
+
+%!test
+%! cmd = ls_command ();
+%! old_wstate = warning ("query");
+%! warning ("off", "Octave:undefined-return-values");
+%! unwind_protect
+%!   [status, output] = unix (cmd);
+%! unwind_protect_cleanup
+%!   warning (old_wstate); 
+%! end_unwind_protect
+%!
+%! if (isunix ())
+%!   assert (status, 0);
+%!   assert (ischar (output));
+%!   assert (! isempty (output));
+%! else
+%!   assert (status, []);
+%!   assert (output, []);
+%! endif
+
+%!error unix ()
+%!error unix (1, 2, 3)
+