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########################################################################
##
## Copyright (C) 2004-2024 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## 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
## <https://www.gnu.org/licenses/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {} unix ("@var{command}")
## @deftypefnx {} {@var{status} =} unix ("@var{command}")
## @deftypefnx {} {[@var{status}, @var{text}] =} unix ("@var{command}")
## @deftypefnx {} {[@dots{}] =} unix ("@var{command}", "-echo")
## Execute a system command if running under a Unix-like operating system,
## otherwise do nothing.
##
## Octave waits for the external command to finish before returning the exit
## status of the program in @var{status} and any output 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, ismac, ispc}
## @end deftypefn
function [status, text] = unix (command, echo_arg)
if (nargin < 1)
print_usage ();
endif
status = 1;
text = "";
if (isunix ())
[status, text] = system (command);
if (nargin > 1 || nargout == 0)
printf ("%s\n", text);
endif
endif
endfunction
%!test
%! cmd = ls_command ();
%! [status, output] = unix (cmd);
%!
%! if (isunix ())
%! assert (status, 0);
%! assert (ischar (output));
%! assert (! isempty (output));
%! else
%! assert (status, 1);
%! assert (output, "");
%! endif
## Test input validation
%!error <Invalid call> unix ()
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