cat /etc/redhat-release |awk '{print $3 >= 6.5;}'

cat /etc/redhat-release ->
CentOS release 6.5 (Final)

cat /etc/redhat-release |awk '{print $3 >= 6.5}'

1

cat /etc/redhat-release |awk '{print $3}'

6.5

awk '$3 >= 6.5 {print}' /etc/redhat-release

awk '{print $3 >= 6.5}' /etc/redhat-release