Synopsis
		sfheaderattr < head.rsf segy=y desc=n

Only nonzero values are reported.

Parameters
		bool desc=n [y/n] if describe keys   bool segy=y [y/n] if SEGY headers

Used In
		DATA          boem-g3d1206-002a/displayin bpmodel94/firstlook chevron2014/fwi chevron2014/geom chevron2014/ntg chevron2014/sxrxvolume new-zealand-kahu-3d/fetch new-zealand-kerry3d/fetch new-zealand-opunake-3d/displayin new-zealand-opunake-3d/fetch new-zealand-parihaka-3d/displayin new-zealand-tui3d/fetch new-zealand-waihapa-3d/fetch new-zealand-waipuku-3d/fetch new-zealand-waka-3d/fetch new-zealand-waka-3d/firstlook seam-phase1-2d/compare seam-phase1-2d/cvs seam-phase1-2d/fetch seam-phase1-2d/filter seam-phase1-2d/ntg seam-phase1-2d/sfawefd2d seam-phase1-2d/sfawefd2d_split seam-phase1-2d/sfmshots seam-phase1-2d/sfmshots1 seam-phase1-2d/sfshot1 seam-phase1-2d/vscan seam_interpret/fetch stratton/fetchbooklet stratton/fetchfinal stratton/fetchgather stratton/fetchslow stratton/fetchvsp teapotdome/angmig teapotdome/cmp_stack_tahstack teapotdome/fetch teapotdome/geom teapotdome/nmostack teapotdome/poststack teapotdome/scdecon teapotdome/tahnmostack teapotdome/tahscplot teapotdome/tahscscale teapotdome/tahsubset teapotdome/teamodel teapotdome/test-preprocessing teapotdome/vels teapotdome/zomig   TCCS          dlchan/testing