#Switch or setup an account for RHC
rhc setup

#Back up your application + database
rhc snapshot save magento

#Create a php-5.3 + mysql 5.1 application based on a Github codebase (you can call your app whatever you want)
rhc app create $appname php-5.3 mysql-5.1 --from-code=https://github.com/openshift/magento-example

#Create a php-5.3 application (you can call your application whatever you want)
rhc app create -a $appname -t php-5.3
#Add MySQL support to your application
rhc app cartridge add -a $appname -c mysql-5.1

I use these commands all the time while dealing with @openshift. I figured it would make sense to spell them out.

Common @openshift RHC commands

Bash