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I'm using TFS2015 update 1. I want to pass information from one build step to the next, how is this possible?

That seems like a very simple task, but I can't figure out how that's suppose to work. Passing a variable to a build step is easy, but passing information from one step to the next seems to be impossible. I hope I'm wrong.

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You can call the task.setvariable Logging Command, which sets a variable in the variable service of taskcontext. The first task can set a variable, and following tasks are able to use the variable. The variable is exposed to the following tasks as an environment variable. Example: 

##vso[task.setvariable variable=testvar;]testvalue
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I know this was answered (and accepted) MONTHS ago. But it's worth pointing out some emphasis on this needing to be the FIRST task in a build... i had a powershell task as the 3rd step and this setvariable did not work... the documentation glosses over the importance of it needing to be first (i was thinking i could modify the variable mid-tasks and use the updated value in subsequent tasks)... in case anyone else needs this.

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