How To Find the RHEL/CentOS Release Version on Amazon Linux

rpm -qa | grep epel-release | awk -F- '{print $3}'
Examples:
RHEL5/Centos5
root@aws1:/root # cat /etc/issue
Amazon Linux AMI release 2010.11.2 (beta)
root@aws1:/root # rpm -qa | grep epel-release
epel-release-5-4.noarch
root@aws1:/root # rpm -qa | grep epel-release | awk -F- ‘{print $3}’
5
RHEL6/Centos6
root@aws2:/root # cat /etc/issue
Amazon Linux AMI release 2013.09
root@aws2:/root # rpm -qa | grep epel-release
epel-release-6-8.9.amzn1.noarch
root@aws2:/root # rpm -qa | grep epel-release | awk -F- ‘{print $3}’
6
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