How to check if file name has a certain ending?

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Aaron 2014-8-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/146960-how-to-check-if-file-name-has-a-certain-ending

评论： Stelios Fanourakis 2018-4-30

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?

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Azzi Abdelmalek 2014-8-9

Do you mean a specific extension?

Aaron 2014-8-9

No, in general, although the extension in my case would be ".mat".

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Answer 1

Image Analyst 2014-8-9

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https://ww2.mathworks.cn/matlabcentral/answers/146960-how-to-check-if-file-name-has-a-certain-ending#answer_147991

编辑：Image Analyst 2014-8-9

在 MATLAB Online 中打开

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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Aaron 2014-8-9

Thanks!

Stelios Fanourakis 2018-4-30

Very helpful answer. Thanks a lot!

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Answer 2

dpb 2014-8-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/146960-how-to-check-if-file-name-has-a-certain-ending#answer_147993

编辑：dpb 2014-8-9

在 MATLAB Online 中打开

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

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dpb 2014-8-9

编辑：dpb 2014-8-10

在 MATLAB Online 中打开

Yeah, that's correct w/ Matlab...I use JPSoft shell with aliases(*) to avoid that so tend to forget. Simple enough to take care of, however, ...

for i=1:length(dNoExt)
  if dNoExt(i).isdir, continue, end  % skip directory entries
  movefile(dNoExt(i).name,[dNoExt(i).name '.yourextension']);
end

(*) The JPSoft command interpreters allow one to write aliases for builtin commands or other programs similarly to aliasing builtin Matlab functions.

C:\> alias dir
*dir /2hzlp /a:-d
C:\> alias ddir
*dir /a:d /hpw

So, if want directories, I use 'ddir', otherwise I'm never bothered by them cluttering up the file list returned. I've often wished TMW had implemented the additional features with dir, especially the attributes. Directories are ok, but the others aren't returned in the structure and altho not often needed, when are it's not particularly convenient. But, as above, having the facility and becoming accustomed to it for so long I occasionally forget not every application "does it right!" :)

Aaron 2014-8-9

Thanks!

dpb 2014-8-9

Note the simplification of eliminating the directory entries above if still interested...

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Answer 3

Azzi Abdelmalek 2014-8-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/146960-how-to-check-if-file-name-has-a-certain-ending#answer_147992

在 MATLAB Online 中打开

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)