/usr/ is in octave-optiminterp 0.3.3-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/octave/
/usr/lib/octave/packages/
/usr/share/
/usr/share/octave/
/usr/share/octave/packages/
/usr/share/octave/packages/3.2/
/usr/share/octave/packages/3.2/optiminterp-0.3.3/
/usr/share/octave/packages/3.2/optiminterp-0.3.3/example_optiminterp.m
/usr/share/octave/packages/3.2/optiminterp-0.3.3/optiminterp1.m
/usr/share/octave/packages/3.2/optiminterp-0.3.3/optiminterp2.m
/usr/share/octave/packages/3.2/optiminterp-0.3.3/optiminterp3.m
/usr/share/octave/packages/3.2/optiminterp-0.3.3/optiminterp4.m
/usr/share/octave/packages/3.2/optiminterp-0.3.3/optiminterpn.m
/usr/share/octave/packages/3.2/optiminterp-0.3.3/test_optiminterp.m
/usr/share/octave/packages/3.2/optiminterp-0.3.3/test_optiminterp_mult.m
/usr/share/octave/packages/3.2/optiminterp-0.3.3/packinfo/
/usr/share/octave/packages/3.2/optiminterp-0.3.3/packinfo/DESCRIPTION
/usr/share/octave/packages/3.2/optiminterp-0.3.3/packinfo/INDEX
/usr/share/octave/packages/3.2/optiminterp-0.3.3/packinfo/.autoload
/usr/share/octave/packages/3.2/optiminterp-0.3.3/doc-cache
/usr/share/doc/
/usr/share/doc/octave-optiminterp/
/usr/share/doc/octave-optiminterp/copyright
/usr/share/doc/octave-optiminterp/changelog.Debian.gz
/usr/lib/octave/packages/3.2/
/usr/lib/octave/packages/3.2/optiminterp-0.3.3/
/usr/lib/octave/packages/3.2/optiminterp-0.3.3/x86_64-pc-linux-gnu-api-v37/
/usr/lib/octave/packages/3.2/optiminterp-0.3.3/x86_64-pc-linux-gnu-api-v37/optiminterp.oct