[GmailFS – Gmail Filesystem][1]

GmailFS supports most file operations such as read, write, open, close, stat, symlink, link, unlink, truncate and rename. This means that you can use all your favourite unix command line tools to operate on files stored on Gmail (e.g. cp, ls, mv, rm, ln, grep etc. etc.).

[1]: http://richard.jones.name/google-hacks/gmail-filesystem/gmail-filesystem.html