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Old 08-07-2009, 03:47 AM   #1
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File Permissions

I have file in my home directory.
I want other users on this system to be able to read from this file and write to this file.
But I don't want anyone to be able to delete this file.
How can I do this?
Old 08-07-2009, 04:12 AM   #2
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I guess what you want is not really possible. If you give write permission to a file, the person also has the right to delete it.
Old 08-07-2009, 04:32 AM   #3
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well This is possible, This happens the case with /tmp directory.
The non-owner user will not be able to delete it even if it has got 777 permission.

check the permission on /tmp directory. If am not sure wether you will be able to achieve what you exactly want but this is possible

Thats basically is sticy bit on /tmp i.e the last t in the permissions.

Explore over it.

Last edited by PMP; 08-07-2009 at 04:36 AM.
Old 08-07-2009, 04:45 AM   #4
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It is possible, with the use of sticky bit. If you set it on a directory, then files inside that directory can only be renamed or removed by the owner of that directory, even if other users have write permissions to the files there.

chmod +t /home/username/dirname
That should do it. If you'll look at the permissions of a directory where sticky bit is set, you'll notice there are "t" letters where the usual "x" (execute) letters usually are. See

 ls -ld /tmp
for an example

Last edited by b0uncer; 08-07-2009 at 04:50 AM.
Old 08-07-2009, 04:54 AM   #5
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Allowing other users to access your home directory isn't a good idea. Put a copy of the file in /tmp/ or a publicly accessible directory which has the sticky bit set. In order to access this file, they would need rx permissions on the parent directory.
Old 08-07-2009, 05:08 AM   #6
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If this file is on an ext2 or ext3 filesystem, then you could use chattr +u.

This would make the file undeletable.


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