MATLAB: How to check if file name has a certain ending

file filename

In the current folder are some files, which do or don't have a filename extension. I would like to check, whether they already have the filename extension or not and add the extension, if necessary.
How do I check the filename extension?

Best Answer

Try this:
myFolder = 'C:\whatever';
if ~isdir(myFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
  uiwait(warndlg(errorMessage));
  return;
end
% Look for all files and add extension of .m if they are missing extension.
filePattern = fullfile(myFolder, '*.*');
allFiles = dir(filePattern);
for k = 1 : length(allFiles)
  baseFileName = allFiles(k).name;
  oldFullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now reading %s\n', oldFullFileName);
  [folder, baseFileName, extension] = fileparts(baseFileName);
  if isempty(extension)
    % No extension, so add a .m extension
    newBaseFileName = sprintf('%s.m', baseFileName);
    newFullFileName = fullfile(myFolder, newBaseFileName);
    movefile(oldFullFileName, newFullFileName);
    fprintf(1, 'Renamed %s to %s\n', oldFullFileName, newFullFileName);
  end
end
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