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+## Copyright (C) 2005 Søren Hauberg
+## 
+## 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+## -*- texinfo -*-
+## @deftypefn {Function File} unzip (@var{filename})
+## @deftypefnx {Function File} unzip (@var{filename}, @var{outputdir})
+## Unpacks the archive @var{filename} using the unzip program.
+## The resulting files are placed in the directory @var{outputdir},
+## which defaults to the current directory.
+## @end deftypefn
+
+## Author: Søren Hauberg <hauberg at gmail dot com>
+
+function files = unzip(filename, outputdir)
+    if (nargin == 0)
+        print_usage("unzip");
+    elseif (nargin == 1)
+        outputdir = ".";
+    endif
+    
+    ## Make sure filename and outputdir are strings
+    if (!ischar(filename) || !ischar(outputdir))
+        error("All arguments must be strings.\n");
+    endif
+    
+    ## Should we append ".zip" to filename?
+    if (length(filename) <= 4 || !strcmp(filename(end-3:end), ".zip"))
+        filename = sprintf("%s.zip", filename);
+    endif
+
+    ## Call unzip
+    [output, status] = system(["unzip -o " filename " -d " outputdir]);
+    if (status != 0)
+        error("unzip returned the following error: %s\n", output);
+    endif
+    
+    ## Create list of extracted files. This might depend on which version
+    ## unzip that it used, although I do not know this for sure.
+    if (nargout)
+        files = strrep(output, "  inflating: ", "");
+        files = split(files, "\n");
+        # remove first and last line from the output
+        files = files(2:end-1, :);
+    endif
+endfunction
+