CentOSのバージョンを調べる
# cat /etc/redhat-release CentOS release 5.5 (Final)
あるいは
# rpm -qa | grep centos-release centos-release-5-5.el5.centos centos-release-notes-5.5-0
# cat /etc/redhat-release CentOS release 5.5 (Final)
あるいは
# rpm -qa | grep centos-release centos-release-5-5.el5.centos centos-release-notes-5.5-0