/usr/share/psychtoolbox-3/PsychOneliners/IsGUI.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
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 8 9 10 11 12 13 14 15 | function rc = IsGUI
% IsGUI - Is the Matlab or Octave GUI enabled in this session?
%
% Returns 1 if GUI is enabled, 0 otherwise.
%
% Matlab's GUI is based on JAVA. Octave's GUI is based on the QT toolkit.
%
if IsOctave && exist('isguirunning', 'builtin')
rc = eval('isguirunning');
else
rc = psychusejava('desktop');
end
return;
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