If run from a class account /home/teachadmin/bin/moss_assignment and /home/teachadmin/bin/yap_assignment should do plagiarism checking using moss or yap on the specified assignment, e.g.:
It unpacks the submissions and guesses the assignment language. It should work OK for simpler assignments.
For more complex assignment, you may need to supply extra arguments or do some pre-processing and invoke moss/yap directly.
No GUI, but this code would useful in building one (but I'm definitely not building a GUI).
I've shifted moss & yap into /home/teachadmin/bin too.