/usr/share/octave/ is in octave-tisean 0.2.3-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/octave/packages/
/usr/share/octave/packages/tisean-0.2.3/
/usr/share/octave/packages/tisean-0.2.3/av_d2.m
/usr/share/octave/packages/tisean-0.2.3/boxcount.m
/usr/share/octave/packages/tisean-0.2.3/c1.m
/usr/share/octave/packages/tisean-0.2.3/c2d.m
/usr/share/octave/packages/tisean-0.2.3/c2g.m
/usr/share/octave/packages/tisean-0.2.3/c2t.m
/usr/share/octave/packages/tisean-0.2.3/d2.m
/usr/share/octave/packages/tisean-0.2.3/delay.m
/usr/share/octave/packages/tisean-0.2.3/doc-cache
/usr/share/octave/packages/tisean-0.2.3/endtoend.m
/usr/share/octave/packages/tisean-0.2.3/false_nearest.m
/usr/share/octave/packages/tisean-0.2.3/ghkss.m
/usr/share/octave/packages/tisean-0.2.3/henon.m
/usr/share/octave/packages/tisean-0.2.3/ikeda.m
/usr/share/octave/packages/tisean-0.2.3/lfo_ar.m
/usr/share/octave/packages/tisean-0.2.3/lfo_run.m
/usr/share/octave/packages/tisean-0.2.3/lfo_test.m
/usr/share/octave/packages/tisean-0.2.3/lyap_k.m
/usr/share/octave/packages/tisean-0.2.3/lyap_r.m
/usr/share/octave/packages/tisean-0.2.3/lyap_spec.m
/usr/share/octave/packages/tisean-0.2.3/lzo_gm.m
/usr/share/octave/packages/tisean-0.2.3/lzo_run.m
/usr/share/octave/packages/tisean-0.2.3/lzo_test.m
/usr/share/octave/packages/tisean-0.2.3/packinfo/
/usr/share/octave/packages/tisean-0.2.3/packinfo/DESCRIPTION
/usr/share/octave/packages/tisean-0.2.3/packinfo/INDEX
/usr/share/octave/packages/tisean-0.2.3/packinfo/NEWS
/usr/share/octave/packages/tisean-0.2.3/pca.m
/usr/share/octave/packages/tisean-0.2.3/poincare.m
/usr/share/octave/packages/tisean-0.2.3/polynom.m
/usr/share/octave/packages/tisean-0.2.3/rbf.m
/usr/share/octave/packages/tisean-0.2.3/spectrum.m
/usr/share/octave/packages/tisean-0.2.3/spikeauto.m
/usr/share/octave/packages/tisean-0.2.3/spikespec.m
/usr/share/octave/packages/tisean-0.2.3/surrogates.m
/usr/share/octave/packages/tisean-0.2.3/timerev.m
/usr/share/octave/packages/tisean-0.2.3/upo.m
/usr/share/octave/packages/tisean-0.2.3/upoembed.m
/usr/share/octave/packages/tisean-0.2.3/xzero.m