Dear Niels,
you should be able to find details about running SPM8 in
batch/unattended/nodisplay mode in the "Batch" part of the SPM manual.
Also, there are a number of messages in the archives of this mailing
list that cover this topic.
Hope this helps,
Volkmar
<https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=SPM;b1c1429.1005>
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