Looking to check NFS file permissions

I am looking for a way to check to see if a file is writeable on a unix server. I originally started writing a lisp to check to see if the file was read only, but quickly realized it would not work as I had intended. The cad operator does not have write access to this folder, so everything will be seen as 'read only'.

I would like to check a file on the server (the output/plot of the cad file) which can be a pdf, jpg, ect. is read only or not via the NFS permissions on the file. Is there a way via Lisp, VLisp or other to check the mode on the file to see what permissions the User/Group/other have? I would like to use this as a way to alert the cad operator that they need to create a new revision of the file that they are working on because the output file has already been delivered to the customer.

(I apologize if I did not use the right words in reference to the file permissions, as I am not very familiar with that type of thing)

Just looking for a direction to go into to handle this if it is possible.

Thanks.

Checkout attributes, or in windows it's Bit Depth (look in the summary of the file properties)

 
(defun c:test ( / app file at ) (vl-load-com)
 (if (setq file (getfiled "Directory" "" "" 16))
   (progn
     (setq app (vlax-get-or-create-object "Scripting.FileSystemObject"))
     (setq file (vlax-invoke app 'getfile file))
     (setq at (vlax-get file 'attributes))
     (vlax-release-object app)(gc)
     (alert (itoa at))
   )
 )(princ)
)