This file is indexed.

/usr/lib/iraf/noao/noao.hd is in iraf-noao 2.16.1+2018.03.10-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Help directory for the NOAO packages.

$artdata	= "./artdata/"
$astrometry	= "./astrometry/"
$astcat		= "./astcat/"
$astutil	= "./astutil/"
$digiphot	= "./digiphot/"
$focas		= "./focas/"
$imred		= "./imred/"
$mtlocal	= "./mtlocal/"
$nobsolete	= "./nobsolete/"
$nproto		= "./nproto/"
$obsutil	= "./obsutil/"
$onedspec	= "./onedspec/"
$rv		= "./rv/"
$surfphot	= "./surfphot/"
$twodspec	= "./twodspec/"

# Define help files for the packages.

artdata		men = artdata$artdata.men,
		hlp = ..,
		sys = artdata$artdata.hlp,
		pkg = artdata$artdata.hd,
		src = artdata$artdata.cl

astcat		men = astcat$astcat.men,
		hlp = ..,
		sys = astcat$astcat.hlp,
		pkg = astcat$astcat.hd,
		src = astcat$astcat.cl

astutil		men = astutil$astutil.men,
		hlp = ..,
		sys = astutil$astutil.hlp,
		pkg = astutil$astutil.hd,
		src = astutil$astutil.cl

digiphot	men = digiphot$digiphot.men,
		hlp = ..,
		sys = digiphot$digiphot.hlp,
		pkg = digiphot$digiphot.hd,
		src = digiphot$digiphot.cl

imred		men = imred$imred.men,
		hlp = ..,
		sys = imred$imred.hlp,
		pkg = imred$imred.hd,
		src = imred$imred.cl

mtlocal		men = mtlocal$mtlocal.men,
		hlp = ..,
		sys = mtlocal$mtlocal.hlp,
		pkg = mtlocal$mtlocal.hd,
		src = mtlocal$mtlocal.cl

nobsolete	men = nobsolete$nobsolete.men,
		hlp = ..,
		sys = nobsolete$nobsolete.hlp,
		pkg = nobsolete$nobsolete.hd,
		src = nobsolete$nobsolete.cl

nproto		men = nproto$nproto.men,
		hlp = ..,
		sys = nproto$nproto.hlp,
		pkg = nproto$nproto.hd,
		src = nproto$nproto.cl

obsutil		men = obsutil$obsutil.men,
		hlp = ..,
		sys = obsutil$obsutil.hlp,
		pkg = obsutil$obsutil.hd,
		src = obsutil$obsutil.cl

onedspec	men = onedspec$onedspec.men,
		hlp = ..,
		sys = onedspec$onedspec.hlp,
		pkg = onedspec$onedspec.hd,
		src = onedspec$onedspec.cl

twodspec	men = twodspec$twodspec.men,
		hlp = ..,
		sys = twodspec$twodspec.hlp,
		pkg = twodspec$twodspec.hd,
		src = twodspec$twodspec.cl

rv		men = rv$rv.men,
		hlp = ..,
		sys = rv$rv.hlp,
		pkg = rv$rv.hd,
		src = rv$rv.cl