I've mounted an MP3 player on a folder:

billy: current user

$home/billy/flash

and I cannot access it through KDE, I can only do it from the console and only when I log in as root. I have tried

#chmod -Rv u-w,u-x /home/billy/flash

#chown -Rv billy /home/billy/flash

and

#chgrp -Rv billy /home/billy/flash

All of them failed. I even tried to change permissions from Mandrake Control center but it also failed. What am I supposed to do????

only unix filesystems can be subjected to changes in unix file permissions (where do you suppose the information would go? instaead permissions and ownerships of non-unix filesystems need to be hard set at mount time, e.g. "mount /dev/blah /mnt/blah -o uid=500,umask=022" says user 500 owns all the files with a mask of 022, i.e. rwxr-xr-x

I have to give the parameters in octal? 'Cause I don't want anyone to have write/execute permission (-o,<others>) to the disk, only the user billy. How do I do that?

chmod 754 "folder Name"

this means that the user will have all privileges , group --> read , and execute , othrer --> read

"chmod -Rv u-w,u-x " what's the -Rv ??

+ you're takin off the write and execute permission for this folder this way ..

am i missing something here ?

as i said, you can't chmod / chown non-unix compliant file systems. set the mask on mount. it's a pretty trivial difference between an octal code an a character string...

What bassem says is correct, but i can't determine this way which user will have the priviledges(I can only type chmod when I log in as root). I can give an -o, but everyone will have access. It is non-unix compatible, I gave this order to the windows partition and it worked. But how do I give priviledges to a specific user?
-Rv is recursevily and verbose mode(it show all files affected by the order)

if you want files to be owned by a different user or group use a uid= or gid= option

while you're logged in $home/billy/ type "ls -al" , this way you'll know every file and folder permission and the owner of it, the root and owner can only change mode

acid kewpie said
..and how do I do that? What is the syntax of this command?

please see the manpage for "mount" for all these syntax queries. that's what it's there for.

OK with the MP3 player(and other USB keys), but I still can't find out how to change permissions on a folder for a specific user. The command chmod isn't helping me 'cause the arguments are incomplete(it has u, but it won't let me specify which user will be the u). And I can't use the command for the current user, 'cause the system is letting me to use the command only when I log in as root. What am I supposed to do?

the user owner is defined by the chown command.

It seems that I didn't know how to change the permissions in the MP3 player after all. I've changed the owner from root to a normal user(through chown and chgrp) but whenever I mount it(sth that I still do from root), and open the folder I mounted it with Konqueror, I don't see my files. I saw in the man pages that this has something to do with the file /etc/fstab, but I got confused. What I want to do is whenever I mount this device(or any USB key), to be fully accessible by a specific user(read, write and execute commands).
Any ideas?

Offtopic: Hey, mr admin, why aren't any avatar options in the profile?

how many times am i going to have to tell you that YOU CAN NOT USE CHMOD / CHOWN ON A NON-UNIX FILESYSTEM? use the umask / uid / gid options in /etc/fstab.

and avatars are disabled, because they are for children and bored housewifes talking about babies.

Eeeeh... any links for that?