/usr/bin/ is in gfan 0.5+dfsg-6.
This file is owned by root:root, with mode 0o755.
..
/usr/bin/gfan_fanhomology
/usr/bin/gfan_fanlink
/usr/bin/gfan_fanproduct
/usr/bin/gfan_fansubfan
/usr/bin/gfan_genericlinearchange
/usr/bin/gfan
/usr/bin/gfan_groebnercone
/usr/bin/gfan_bases
/usr/bin/gfan_buchberger
/usr/bin/gfan_combinerays
/usr/bin/gfan_doesidealcontain
/usr/bin/gfan_fancommonrefinement
/usr/bin/gfan_groebnerfan
/usr/bin/gfan_homogeneityspace
/usr/bin/gfan_homogenize
/usr/bin/gfan_initialforms
/usr/bin/gfan_interactive
/usr/bin/gfan_ismarkedgroebnerbasis
/usr/bin/gfan_krulldimension
/usr/bin/gfan_latticeideal
/usr/bin/gfan_leadingterms
/usr/bin/gfan_list
/usr/bin/gfan_markpolynomialset
/usr/bin/gfan_minkowskisum
/usr/bin/gfan_minors
/usr/bin/gfan_mixedvolume
/usr/bin/gfan_overintegers
/usr/bin/gfan_padic
/usr/bin/gfan_polynomialsetunion
/usr/bin/gfan_render
/usr/bin/gfan_renderstaircase
/usr/bin/gfan_saturation
/usr/bin/gfan_secondaryfan
/usr/bin/gfan_stats
/usr/bin/gfan_substitute
/usr/bin/gfan_symmetries
/usr/bin/gfan_tolatex
/usr/bin/gfan_topolyhedralfan
/usr/bin/gfan_tropicalbasis
/usr/bin/gfan_tropicalbruteforce
/usr/bin/gfan_tropicalevaluation
/usr/bin/gfan_tropicalfunction
/usr/bin/gfan_tropicalhypersurface
/usr/bin/gfan_tropicalintersection
/usr/bin/gfan_tropicallifting
/usr/bin/gfan_tropicallinearspace
/usr/bin/gfan_tropicalmultiplicity
/usr/bin/gfan_tropicalrank
/usr/bin/gfan_tropicalstartingcone
/usr/bin/gfan_tropicaltraverse
/usr/bin/gfan_tropicalweildivisor
/usr/bin/gfan_version