/usr/share/man/ is in gfan 0.5+dfsg-6.
This file is owned by root:root, with mode 0o755.
..
/usr/share/man/man1/
/usr/share/man/man1/gfan.1.gz
/usr/share/man/man1/gfan_bases.1.gz
/usr/share/man/man1/gfan_buchberger.1.gz
/usr/share/man/man1/gfan_combinerays.1.gz
/usr/share/man/man1/gfan_doesidealcontain.1.gz
/usr/share/man/man1/gfan_fancommonrefinement.1.gz
/usr/share/man/man1/gfan_fanhomology.1.gz
/usr/share/man/man1/gfan_fanlink.1.gz
/usr/share/man/man1/gfan_fanproduct.1.gz
/usr/share/man/man1/gfan_fansubfan.1.gz
/usr/share/man/man1/gfan_genericlinearchange.1.gz
/usr/share/man/man1/gfan_groebnercone.1.gz
/usr/share/man/man1/gfan_groebnerfan.1.gz
/usr/share/man/man1/gfan_homogeneityspace.1.gz
/usr/share/man/man1/gfan_homogenize.1.gz
/usr/share/man/man1/gfan_initialforms.1.gz
/usr/share/man/man1/gfan_interactive.1.gz
/usr/share/man/man1/gfan_ismarkedgroebnerbasis.1.gz
/usr/share/man/man1/gfan_krulldimension.1.gz
/usr/share/man/man1/gfan_latticeideal.1.gz
/usr/share/man/man1/gfan_leadingterms.1.gz
/usr/share/man/man1/gfan_list.1.gz
/usr/share/man/man1/gfan_markpolynomialset.1.gz
/usr/share/man/man1/gfan_minkowskisum.1.gz
/usr/share/man/man1/gfan_minors.1.gz
/usr/share/man/man1/gfan_mixedvolume.1.gz
/usr/share/man/man1/gfan_overintegers.1.gz
/usr/share/man/man1/gfan_padic.1.gz
/usr/share/man/man1/gfan_polynomialsetunion.1.gz
/usr/share/man/man1/gfan_render.1.gz
/usr/share/man/man1/gfan_renderstaircase.1.gz
/usr/share/man/man1/gfan_saturation.1.gz
/usr/share/man/man1/gfan_secondaryfan.1.gz
/usr/share/man/man1/gfan_stats.1.gz
/usr/share/man/man1/gfan_substitute.1.gz
/usr/share/man/man1/gfan_symmetries.1.gz
/usr/share/man/man1/gfan_tolatex.1.gz
/usr/share/man/man1/gfan_topolyhedralfan.1.gz
/usr/share/man/man1/gfan_tropicalbasis.1.gz
/usr/share/man/man1/gfan_tropicalbruteforce.1.gz
/usr/share/man/man1/gfan_tropicalevaluation.1.gz
/usr/share/man/man1/gfan_tropicalfunction.1.gz
/usr/share/man/man1/gfan_tropicalhypersurface.1.gz
/usr/share/man/man1/gfan_tropicalintersection.1.gz
/usr/share/man/man1/gfan_tropicallifting.1.gz
/usr/share/man/man1/gfan_tropicallinearspace.1.gz
/usr/share/man/man1/gfan_tropicalmultiplicity.1.gz
/usr/share/man/man1/gfan_tropicalrank.1.gz
/usr/share/man/man1/gfan_tropicalstartingcone.1.gz
/usr/share/man/man1/gfan_tropicaltraverse.1.gz
/usr/share/man/man1/gfan_tropicalweildivisor.1.gz
/usr/share/man/man1/gfan_version.1.gz