So here is one way to do it (on an Ubuntu box):
1. Open a terminal
2. Install "curl": sudo apt-get install curl
3. Find out the web-adresses of your respective REST services and their needed inputs
4. Issue the following (exemplary) command:curl -v -s -H "X-Requested-Auth: Digest" --digest -u your_remotesystem_account:theverygoodpassword --form-string "workflowDefinitionId=full" -F "file=@media.zip"
http://webappserver.tuwien.ac.at/ingest/addZippedMediaPackage
&
5. Play around a bit to get the syntax/inputs right, check if the status of your webapp has changed, if not, retry
6. Be happy ;)