I am using Centos and I did ll command for one of the directory. Owners of the files within the directory are some numbers instead of username. Can you please explain why is that ?If you see below instead of root as the owner, it is showing 600 as the owner. And there is no user called as 600. Why is that ?-rw-rw-r-x.  1  600 root 1696 Jun 27  2016 abc.txt-rw-rw-r-x.  1  600 root 1696 Jun 27  2016 xyz.txt-rw-rw-r-x.  1  600 root 1692 Jun 27  2016 hagts.txt
Directory owner is a number instead of a name in Centos. Why is that?
centos;permissions;uid