/usr/share/octave/site/m/sundialsTB/idas/function_types/ is in octave-sundials 2.5.0-3+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDABandJacFn.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDABandJacFnB.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDADenseJacFn.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDADenseJacFnB.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDAGcommFn.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDAGcommFnB.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDAGlocalFn.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDAGlocalFnB.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDAJacTimesVecFn.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDAJacTimesVecFnB.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDAMonitorFn.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDAMonitorFnB.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDAPrecSetupFn.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDAPrecSetupFnB.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDAPrecSolveFn.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDAPrecSolveFnB.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDAQuadRhsFn.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDAQuadRhsFnB.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDAResFn.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDAResFnB.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDARootFn.m
/usr/share/octave/site/m/sundialsTB/idas/function_types/IDASensResFn.m