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How do I determine which eclipse sdk is being used?

I have multiple eclipse SDKs installed on my linux notebook. They are in different directories and I do not remember which is the last one I installed. The command 'which eclipse' gets me /usr/bin/eclipse. /usr/bin/eclipse is a shell script that (among other things) sets ECLIPSE=/usr/lib/eclipse/eclipse. /usr/lib/eclipse/eclipse is a real executable (not a link) that was copied in from elsewhere.

The command 'eclipse' brings up a functioning eclipse. My question is: If I want to expand the capabilities of this eclipse, which SDK do I need to make changes to - ie which SDK do I insert add-ons? That is, given an executing eclipse, how do I find the sdk?

On the Help > About Eclipse dialog click Installation Details for lots of details about the installation. The Configuration tab contains the paths of what is being used.

Adding to Eclipse is generally done using Help > Install New Software and you don't normally need to know where the Eclipse install is for this!

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