how did you determine the features and repo of an eclipse plugin?

[tuxcrafter]

I want to automate the installation of the newer version of subclipse, hudson/jenkins for starters, I also got some local jar file plugins. I been searching for uptodate documentation and trial and error. I can use some tips and tricks. Thank you!

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[nwoetzel]

I've used this blog post as an orientation to install plugins through the commandline:
http://www.lorenzobettini.it/2012/10/installing-eclipse-features-via-the-command-line/
It is still valid.
Local plugins can in theory be copied/extracted into the plugins/features folder, when they have the proper structure (plugins and features). But you can also treat a zip like a 'repo', even when they are remote. Something like this should work:
jar:http://example.com/plugin.zip!/
or
jar:file:///home/user/plugin.zip!/
To the question in the heading. The update site is something you should know. But if it is a marketplace item, you can install it. And the plugin usually adds its update-site to the list of available sites.
The Installation Unit Names you will need to get through the user-interface (or once they are installt, goto help->about->installation details, find the plugin and it has the name of the feature group in that list).