curl http://localhost:9001/EDX/EDX201/import/2013_Winter --cookie \
    "edxloggedin=true; sessionid=887329812981878491abc18970fd52a7; csrftoken=CSJWODSJIer90834uofjh890439hfdjs" \ 
    -X POST --form "course-data=@2013_Winter.tar.gz" -H "X-CSRFToken: CSJWODSJIer90834uofjh890439hfdjs"

would work, right? Pasting multiline is a bit more awkward, but I'm not too concerned about saving copy-pasters and extra 10 seconds...