/usr/share/octave/packages/control-3.0.0/@frd/ 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/@frd/__c2d__.m
/usr/share/octave/packages/control-3.0.0/@frd/__ctranspose__.m
/usr/share/octave/packages/control-3.0.0/@frd/__d2c__.m
/usr/share/octave/packages/control-3.0.0/@frd/__freqresp__.m
/usr/share/octave/packages/control-3.0.0/@frd/__get__.m
/usr/share/octave/packages/control-3.0.0/@frd/__minreal__.m
/usr/share/octave/packages/control-3.0.0/@frd/__pole__.m
/usr/share/octave/packages/control-3.0.0/@frd/__set__.m
/usr/share/octave/packages/control-3.0.0/@frd/__sys2ss__.m
/usr/share/octave/packages/control-3.0.0/@frd/__sys2tf__.m
/usr/share/octave/packages/control-3.0.0/@frd/__sys_connect__.m
/usr/share/octave/packages/control-3.0.0/@frd/__sys_data__.m
/usr/share/octave/packages/control-3.0.0/@frd/__sys_group__.m
/usr/share/octave/packages/control-3.0.0/@frd/__sys_inverse__.m
/usr/share/octave/packages/control-3.0.0/@frd/__sys_keys__.m
/usr/share/octave/packages/control-3.0.0/@frd/__sys_prune__.m
/usr/share/octave/packages/control-3.0.0/@frd/__times__.m
/usr/share/octave/packages/control-3.0.0/@frd/__transpose__.m
/usr/share/octave/packages/control-3.0.0/@frd/__zero__.m
/usr/share/octave/packages/control-3.0.0/@frd/display.m
/usr/share/octave/packages/control-3.0.0/@frd/frd.m