/usr/share/octave/ is in octave-splines 1.2.6-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/octave/packages/
/usr/share/octave/packages/splines-1.2.6/
/usr/share/octave/packages/splines-1.2.6/bin_values.m
/usr/share/octave/packages/splines-1.2.6/catmullrom.m
/usr/share/octave/packages/splines-1.2.6/csape.m
/usr/share/octave/packages/splines-1.2.6/csapi.m
/usr/share/octave/packages/splines-1.2.6/csaps.m
/usr/share/octave/packages/splines-1.2.6/csaps_sel.m
/usr/share/octave/packages/splines-1.2.6/dedup.m
/usr/share/octave/packages/splines-1.2.6/doc-cache
/usr/share/octave/packages/splines-1.2.6/fnder.m
/usr/share/octave/packages/splines-1.2.6/fnplt.m
/usr/share/octave/packages/splines-1.2.6/fnval.m
/usr/share/octave/packages/splines-1.2.6/packinfo/
/usr/share/octave/packages/splines-1.2.6/packinfo/.autoload
/usr/share/octave/packages/splines-1.2.6/packinfo/DESCRIPTION
/usr/share/octave/packages/splines-1.2.6/packinfo/INDEX
/usr/share/octave/packages/splines-1.2.6/packinfo/NEWS
/usr/share/octave/packages/splines-1.2.6/tpaps.m
/usr/share/octave/packages/splines-1.2.6/tps_val.m