Linux - cannot remove owned file with 777 permissions

Question

I've couple of files that I cannot remove using rf -Rf command. I'm the owner of those file and the group assigned to those files is also a group my user is in. What's even weirder is that I can edit their content and I can change the permissions for them, but I can't move or delete them.

ls -al
total 12
dr-xr-xr-x 3 rayell pg1083760 4096 2010-10-10 10:00 .
drwxr-xr-x 3 rayell pg1083760 4096 2011-09-02 04:33 ..
-rwxrwxrwx 1 rayell pg1083760    0 2011-09-02 06:38 default.settings.php
drwxrwxrwx 2 rayell pg1083760 4096 2011-09-02 04:33 files
-rwxrwxrwx 1 rayell pg1083760    0 2011-09-02 06:38 settings.php


rm -Rf *
rm: cannot remove `default.settings.php': Permission denied
rm: cannot remove directory `files': Permission denied
rm: cannot remove `settings.php': Permission denied

Can anyone tell me what is happening?

Answer 1

To remove one file you need write permission on the directory that contains¹ this file.

Here the permissions are dr-xr-xr-x 3 rayell pg1083760 4096 2010-10-10 10:00 . So nobody (other than root) can remove files inside this directory. The owner must use chmod first.

—
^{1. There are pretty good reasons for that. By ‘removing’ a file with rm, you are in fact trying to unlink it from the directory (hardlinked copies will not be deleted).}

Answer 2

The reason is that the parent directory has chmod 705 or something like that. You can chmod the parent directory by the following command:

chmod -R 777 directory_name

After this, you can remove that directory and the files it contains.