I've deployed a farm solution to a test environment by following the Technet Deploy solution packages page - works well. But development continues, and I need to redeploy.
When I follow the process again I get the error
Add-SPSolution: A solution with the same name "awesomewebparts.wsp" or id "[a random identifier string]" already exists in the solution store.
I gather that I need to either remove the existing version before adding the new version, or issuing a different command to update or overwrite the existing version. Can anyone provide any direction on how this should be done?