Plagiarism

Owned by Derrick Lin
May 18, 2024
1 min read

Plagiarism Detection

Currently the most widely used code plagiarism detection software for programming assignment is serviced by Moss

~give/stable/bin/ contains scripts to make the process easier:

  • moss - sends submissions to moss for processing.

% moss -l python -m 4 -b template.py -d "*/*.py"

  • moss_setup - retrieve submissions and put them into directories suitable for moss-ing.

% ~give/stable/bin/moss_setup  21T2  ass1

a plague directory will be created under ~/21T2.work/ass1

remove any files not to be included in moss plagiarism detection

copy template files to plague/Samples to ignore similarity from these files

  • moss_run - wrapper script for moss script.

% ~give/stable/bin/moss_run  en1811  21T2  ass1  python  "*/*.py"

% ~give/stable/bin/moss_run  -d /home/en1811/21T2.work/ass1/plague  python  "*/*.py"

last two arguments specify the programming language (python) and which files to process (all .py files for each student).

  • plague.pl

    1. Paste everything on moss summary page into moss_report_file 

    2. Look at similarities in code on moss pages and select plagiarised pairs:

% plague.pl -s  assignment  moss_report_file  selected_plague_file

c. Report assignment mark, submission history

% plague.pl -r  assignment  selected_plague_file

Plagiarism Procedures