Can't save new file even though I definitely have write permissions

120 次查看（过去 30 天）
Daniel Klisiewicz
Daniel Klisiewicz 2023-12-20
回答： Daniel Klisiewicz 2023-12-22
I'm trying to save a .mat file in the following manner:
save('/path/to/file/file.mat','var1','var2');
I'm getting the "Cannot save /path/to/file/file.mat: Permission denied" that you typically get when the user running Matlab does not have permissions to write to the directory specified.
The problem is I ABSOLUTELY have write permissions to /path/to/file.
The output to
ls -l '/path/to/'
shows the 'file' directory as drwxrwxr-x, and belongs to group "Developers", which I am a part of.
Further proof that I have write permissions: If I cd /path/to/file/ and then create a file named 'file.mat' using vim, and THEN invoke Matlab's save as described above, it WORKS!. If I then remove that file using a terminal and try to save from Matlab again, it FAILS!
Why might I not be able to create a new file from Matlab?
The only nuance I can think of is /path/to/file is an NFS mount on RHEL7
  2 个评论
Walter Roberson
Walter Roberson 2023-12-20
I no longer recall... if /path/to/file is an NFS mount point, then does ls -l reflect the permissions of the underlying mount point, or does it reflect the permissions of the mounted filesystem ?
Daniel Klisiewicz
Daniel Klisiewicz 2023-12-21
编辑：Daniel Klisiewicz 2023-12-21
given that I can can change the permissions of /path/to/file on the mounted location and have it reflect in the ls -l output, I'm led to believe that it reflects the underlying mount point and not the filesystem itself.
This is a good point to consider, although I'm not sure if it explains why I can create a file from a terminal at the mount point but not from an instance of matlab at the same location?

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采纳的回答

Daniel Klisiewicz
Daniel Klisiewicz 2023-12-22
It turns out that the Matlab session was launched prior to myself being added to the 'Developer' group. A log out, log in, and relaunch of Matlab fixed the issue.

更多回答（1 个）

Sulaymon Eshkabilov
Sulaymon Eshkabilov 2023-12-20
Check the permission:
% Specify the path you want to check
folderPath = '/path/to/file/file.mat';
% Get file attributes
attributes = fileattrib(folderPath);
% Check if you have the write permission in the folder
if attributes==1
disp('Write permission is available for you! :)');
else
disp('Write permission is NOT available for you! :(');
end

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