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## Copyright (C) 2004-2013 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 @qcode{"-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)
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