$ touch shit
$ chown root shit
chown: changing ownership of `shit': Operation not permitted
$ chown root. shit
chown: changing ownership of `shit': Operation not permitted
$ rm shit
$ su
# touch shit
# chown user:user shit
# ls -l shit
-rw-r--r-- 1 user user 0 июля 13 20:48 shit
Почему chown работает только от рута?
$ which chown
/bin/chown
$ stat /bin/chown
File: `/bin/chown'
Size: 59880 Blocks: 120 IO Block: 4096 regular file
Device: 802h/2050d Inode: 1219397 Links: 1
Access: (0755/-rwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2012-07-13 20:40:06.008877041 +0400
Modify: 2012-05-23 16:17:18.929820158 +0400
Change: 2012-05-23 16:17:21.880820289 +0400
Birth: -