How can I find out what version of Red Hat Enterprise Linux install media I am using to enter rescue mode?

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After booting into Rescue Mode, there will be a file that can be accessed the determine the version of Red Hat Enterprise Linux install media being used. Use the following command:

cat /tmp/product/.buildstamp

...

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How can I find out what version of Red Hat Enterprise Linux install media I am using to enter rescue mode?

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New to Red Hat?