/usr/share/psychtoolbox-3/PsychInitialize/Contents.m is in psychtoolbox-3-common 3.0.9+svn2579.dfsg1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | % Psychtoolbox:PsychInitialize
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% help Psychtoolbox % For an overview, triple-click me & hit enter.
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% finish - Restores the OS X update process on MATLAB exit.
% IsStartUpdateImplantedInFinish - True if finish.m will restart the update process
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