$ cat /etc/*-release
output
CentOS release 5.9 (Final)
$ lsb_release -a
output
LSB Version: :core-4.0-ia32:core-4.0-noarch:graphics-4.0-ia32:graphics-4.0-noarch:printing-4.0-ia32:printing-4.0-noarch
Distributor ID: CentOS
Description: CentOS release 5.9 (Final)
Release: 5.9
Codename: Final