Command line client does not support apikey

> If necessary it would be straighforward to add command line support for the api key, even if it is on the way out.
Yes, that's a reasonable approach. An alternative is to request that portals users create Synapse passwords to use with the CLI.

I do not have a specific instance where a user has been blocked from using the CLI because they created a Synapse account via Google but I expect this issue to present itself in the near future as the OAuth has been released for several months at this point.

Yes Jordan, this is critical because we are publishing portal documentation (in print, that cannot be revised at a later date) with step-by-step instructions of downloading data via the synapseclient from the command line. I received feedback from scientists across teams that this documentation needed to include best practices for keeping credentials secure. At this point, the tools we have available for that in our programmatic clients is caching credentials and using an apikey instead of a password (and creating a Synapse config file, although I view that as a slightly more advanced use case). I think adding support for the api key is a great interim solution.

This is resolved and will be included in the next RC. In the command line client you can use the api key as you would the password.

code looks good!

Tested release candidate for version 2.2.0 and am able to pass the apikey as a password to authenticate.