/usr/share/octave/ is in octave-pfstools 2.1.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/octave/site/
/usr/share/octave/site/m/
/usr/share/octave/site/m/pfstools/
/usr/share/octave/site/m/pfstools/pfs_close_frames.m
/usr/share/octave/site/m/pfstools/pfs_open_frames.m
/usr/share/octave/site/m/pfstools/pfs_read_luminance.m
/usr/share/octave/site/m/pfstools/pfs_read_rgb.m
/usr/share/octave/site/m/pfstools/pfs_read_xyz.m
/usr/share/octave/site/m/pfstools/pfs_write_rgb.m
/usr/share/octave/site/m/pfstools/pfssize.m
/usr/share/octave/site/m/pfstools/pfsview.m
/usr/share/octave/site/m/pfstools/pfsview_list.m
/usr/share/octave/site/m/pfstools/pfsview_rgb.m