Grive was an unofficial, open source command line Linux client for Google Drive. I say "was" because the tool no longer works due to Google changing it's API recently and Grive not being maintained any more (there are no commits on its GitHub page since May, 2013).

To get Grive up and running again, Vitaliy Filippov forked it and named his fork "Grive2". The fork supports the new Google Drive REST API and it also includes a new feature: partial (directory) sync, along with bug fixes.

Grive, an open source command-line Google Drive Linux client is quickly evolving, and the latest version from GIT has solved the issues in the previous release available in our PPA: when a file is deleted locally, it's no longer ignored and it's deleted remotely too; also, the multiple file upload bug has been fixed.