/usr/share/octave/packages/signal-1.2.2/hann.m is in octave-signal 1.2.2-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | % w = hann(n)
% see hanning
function w = hann(n), w=hanning(n);
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