Linux permissions are not respected

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http://serverfault.com – I've run into a perplexing problem where user permissions are not being respected on a Linux computer. Other users are able to move and delete files they don't own. Is there a way to restrict this? Why is this happening? Here's an example. # Become user jen [root@localhost test]# su jen # Display files in the current directory [jen@localhost test]$ ls -al total 24 drwxrwxrwx. 3 root root 4096 Apr 10 09:49 . dr-xr-xr-x. 19 root root 4096 Apr 9 18:19 .. drwx------. 2 root root 16384 Apr 9 16:15 lost+found [jen@localhost test]$ touch jen_file [jen@localhost test]$ ls -l total 16 -rw-rw-r (HowTos)