How to check if file name has a certain ending?

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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?
  2 Comments
Aaron
Aaron on 9 Aug 2014
No, in general, although the extension in my case would be ".mat".

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Accepted Answer

Image Analyst
Image Analyst on 9 Aug 2014
Edited: Image Analyst on 9 Aug 2014
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

More Answers (2)

dpb
dpb on 9 Aug 2014
Edited: dpb on 9 Aug 2014
dNoExt=dir('*.');
Returns all files with no extension in CWD in the dir structure dNoExt. Process as
for i=1:length(dNoExt)
if dNoExt(i).isdir, continue, end % skip directory entries
movefile(dNoExt(i).name,[dNoExt(i).name '.yourextension']);
end
Or, one can cleanup the returned directory entries first before the loop as
dNoExt=dNoExt(~[dNoExt.isdir]); % retain only files in structure
  4 Comments
dpb
dpb on 9 Aug 2014
Note the simplification of eliminating the directory entries above if still interested...

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Azzi Abdelmalek
Azzi Abdelmalek on 9 Aug 2014
d=dir('*.*')
e={d.name}'
f=e(~cellfun(@isdir,e))
ii=regexp(f,'\.+','match')
jj=find(cellfun(@isempty ,ii))
g1=f(jj)
g2=strcat(g1,'.ext')
cellfun(@(x,y) movefile(x,y),g1,g2)
  1 Comment
Aaron
Aaron on 9 Aug 2014
I didn't try your code, because the other answers here seem a bit easier to me. But thank you for your answer!

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