/usr/share/octave/packages/control-3.0.0/@ss/ is in octave-control 3.0.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/octave/packages/control-3.0.0/@ss/__c2d__.m
/usr/share/octave/packages/control-3.0.0/@ss/__ctranspose__.m
/usr/share/octave/packages/control-3.0.0/@ss/__d2c__.m
/usr/share/octave/packages/control-3.0.0/@ss/__freqresp__.m
/usr/share/octave/packages/control-3.0.0/@ss/__get__.m
/usr/share/octave/packages/control-3.0.0/@ss/__minreal__.m
/usr/share/octave/packages/control-3.0.0/@ss/__pole__.m
/usr/share/octave/packages/control-3.0.0/@ss/__prescale__.m
/usr/share/octave/packages/control-3.0.0/@ss/__set__.m
/usr/share/octave/packages/control-3.0.0/@ss/__sys2frd__.m
/usr/share/octave/packages/control-3.0.0/@ss/__sys2tf__.m
/usr/share/octave/packages/control-3.0.0/@ss/__sys_connect__.m
/usr/share/octave/packages/control-3.0.0/@ss/__sys_data__.m
/usr/share/octave/packages/control-3.0.0/@ss/__sys_group__.m
/usr/share/octave/packages/control-3.0.0/@ss/__sys_inverse__.m
/usr/share/octave/packages/control-3.0.0/@ss/__sys_keys__.m
/usr/share/octave/packages/control-3.0.0/@ss/__sys_prune__.m
/usr/share/octave/packages/control-3.0.0/@ss/__times__.m
/usr/share/octave/packages/control-3.0.0/@ss/__transpose__.m
/usr/share/octave/packages/control-3.0.0/@ss/__zero__.m
/usr/share/octave/packages/control-3.0.0/@ss/display.m
/usr/share/octave/packages/control-3.0.0/@ss/ss.m