Hi I'm looking into how to create a self-signed SSL on CentOS 6.x and the reference I am looking at says I should issue the command :   yum install mod_ssl  .

I assume mod_ssl would have been installed with Apache.  So I would like to check that.  I looked at the man page for yum and it seems there is no way to check if it is installed.

How can I check to see if a package or module has been installed?

Thanks!!

Keith