yum search - package version

You can find the version number of a package in your repositories with the yum info command.

# yum info rabbitmq-server
Available Packages
Name        : rabbitmq-server
Arch        : noarch
Version     : 2.6.1
Release     : 1.fc16
Size        : 1.1 M
Repo        : updates
Committer   : Peter Lemenkov <[email protected]>
Committime  : Tue Nov  8 13:00:00 2011
Buildtime   : Tue Nov  8 10:31:03 2011
Summary     : The RabbitMQ server
URL         : http://www.rabbitmq.com/
License     : MPLv1.1
Description : RabbitMQ is an implementation of AMQP, the emerging standard for high
            : performance enterprise messaging. The RabbitMQ server is a robust and
            : scalable implementation of an AMQP broker.

To find the version numbers of installed packages, you can use rpm with the -q option.

# rpm -q kernel
kernel-3.3.1-5.fc16.x86_64
kernel-3.3.2-1.fc16.x86_64
kernel-3.3.2-6.fc16.x86_64

AFAIK, yum info only shows information for one specific "instance" of a package. I wanted to know not what version I had installed but which were available on the repos. So this did it for me:

yum -v list package_name --show-duplicates

You can get more info with the following command:

yum info rabbitmq

OR

yum list rabbitmq

if you prefer condensed output.