TeamCity, passing an id generated in one build step to a later build step?

Yes, you can set an environment variable in one build step and use it in the following step. You will need to use a service message in your build script as described here http://confluence.jetbrains.net/display/TCD65/Build+Script+Interaction+with+TeamCity#BuildScriptInteractionwithTeamCity-AddingorChangingaBuildParameterfromaBuildStep to dynamically update a build parameter, which you can use in the next step. Note, that it won't be available in the step that generates it, only in the next one.

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