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I have access to a cifs network drive. When I mount it under my OSX machine, I can read and write from and to it.

When I mount the drive in ubuntu, using:

sudo mount -t cifs -o username=${USER},password=${PASSWORD} //server-address/folder /mount/path/on/ubuntu

I am not able to write to the network drive, but I can read from it. I have checked the permissions and owner of the mount folder, they look like:

4.0K drwxr-xr-x  4 root root    0 Nov 12  2010 Mounted_folder

I cannot change the owner, because I get the error:

chown: changing ownership of `/Volumes/Mounted_folder': Not a directory

When I descend deeper into the network drive, and change the ownership there, I get the error that I have no permission to change the folder´s owner.

What should I do to activate my write permission?

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Is the file system listed in /etc/fstab? If so, what options does the entry have? – Jenny D Mar 15 '13 at 15:51

2 Answers 2

up vote 26 down vote accepted

You are mounting the CIFS share as root (because you used sudo), so you cannot write as normal user. If your Linux Distribution and its kernel are recent enough that you could mount the network share as a normal user (but under a folder that the user own), you will have the proper credentials to write file (e.g. mount the shared folder somewhere under your home directory, like for instance $HOME/netshare/. Obviously, you would need to create the folder before mounting it).

An alternative is to specify the user and group ID that the mounted network share should used, this would allow that particular user and potentially group to write to the share. Add the following options to your mount: uid=<user>,gid=<group> and replace <user> and <group> respectively by your own user and default group.

sudo mount -t cifs -o username=${USER},password=${PASSWORD},uid=<user>,gid=<group> //server-address/folder /mount/path/on/ubuntu
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it worked for me! But we should add that if the shared folder is in a PC with a login domain you should add the option domain. Something like this: sudo mount -t cifs -o username=${USER},password=${PASSWORD},dom=${DOMAIN}, uid=<user>,gid=<group> //server-address/folder /mount/path/on/ubuntu In fact the domain can go in the "username" option, but remember that you have to use / instead of `, like username=DOMAIN/`. – João Portela Dec 19 '14 at 9:17
Yes, that's correct. :-) One might need to specify the domain or workgroup (for older Windows version) via the "domain=" option or via the username, that's a good point. And sometimes it is even necessary to specify the encryption scheme or the CIFS version to be used. But all this was not part of this question, so I left it aside. :-) – Huygens Dec 20 '14 at 16:08
This is just what I needed. I had an entry in /etc/fstab to auto mount the network drive on startup. I could not write to the mount so I added ,uid=<myUserID> for a line that looks like this: // /colmustang cifs username=<uname>,password=<upassword>,uid=<myUserID> 0 0 – James May 22 at 1:34

The solution is effective, I tested the command succesfully:

sudo mount -t cifs -o username=miuser,password=patito,uid=1001,gid=1001 // /home/ususario/Documentos/benz-win
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I am not sure if you the credentials you posted are genuine or not, but I strongly suggest to remove them from your post. – Vincent Aug 1 '13 at 23:32
Use "id -u <user>" and "id -g <user> to get the uid and gid respectively. – nvd Sep 16 '14 at 10:00
If the credentials are in the post then they are compromised. Deleting them now won't remove the history. – Stu Thompson Oct 15 '14 at 15:58
Credentials are compromised if somebody has access to private IP address – Dženan Aug 27 at 15:29
And what is the added value of this answer compared with the accepted answer? Except you disclose your credentials (in case they are real). – ruffp Oct 21 at 11:52

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