This isn't a public command, which means it doesn't implement the interface that the public commands use to get help, descriptions, and support the minimum required arguments (such as :output=json).
You'll have to use an external means to find the extension you're looking for; probably grep.
jking@ .svn $ curl -qsk -u <user>:<pass> https://<system>:8443/remote/ext.list | grep EPOCore
EPOCore 188.8.131.522180907 installed ga 2013-12-18 09:52:51.097
Can this command can be exposed as public, and documented? McAfee Security Bulletins, such as SB10043, sometimes require an extension to be upgraded; and rather than providing all of our customers with a manual process, we would like to automate the process. In order to verify that the current version needs to be upgraded, I believe we need an API command. Is there some other public command capable of providing this information?
I understand that an external method will be required to parse the output of the ext.list command. That answers my second question.
I don't suppose you can tell me if there is another unexposed command that will allow me to search or find a specific extension, rather than listing them all? Perhaps there is a way to do this via an ad hoc query?