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I think Chmod will not work properly, if permissions are going to be assigned at user level.
I mean to say that if a user is trying to alter permissions for another user, then chmod will let you do so.
Anyways, this is the detailed description regarding permissions at different levels :
400 read by owner
040 read by group
004 read by anybody (other)
200 write by owner
020 write by group
002 write by anybody
100 execute by owner
010 execute by group
001 execute by anybody
Whether or not a file can be deleted has to do with the permissions of the directory it's in, not the file itself. You could create a file, belonging to root and set its permissions to 000, but if it's in my $HOME directory, I can delete it.
root /home/telemachus # chown root:root zero
root /home/telemachus # chmod 000 zero
root /home/telemachus # ls -l zero
---------- 1 root root 0 2008-12-24 16:48 zero
root /home/telemachus # exit
telemachus ~ $ rm zero
rm: remove write-protected regular empty file `zero'? y
telemachus ~ $ ls
bin changes Desktop firstclass images_backup lib musica storage
books debian_stuff firefox iliumSvn kernels man practice tint2