/usr/lib/iraf/extern/rvsao/r2rvsao.hd is in iraf-rvsao 2.8.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | # Help directory for the SAO TDC radial velocity package.
$doc = "r2rvsao$Doc/"
bcvcorr hlp=doc$bcvcorr.hlp, src=rvsao$Util/t_bcvcorr.x
contpars hlp=doc$contpars.hlp, src=rvsao$contpars.par
contsum hlp=doc$contsum.hlp, src=rvsao$contsum.par
xcsao hlp=doc$xcsao.hlp, src=rvsao$Xcsao/t_xcsao.x
emsao hlp=doc$emsao.hlp, src=rvsao$Emsao/t_emsao.x
eqwidth hlp=doc$eqwidth.hlp, src=rvsao$Eqwidth/t_eqwidth.x
qplot hlp=doc$qplot.hlp, src=rvsao$qplot.cl
relearn hlp=doc$relearn.hlp, src=rvsao$relearn.cl
linespec hlp=doc$linespec.hlp, src=rvsao$Makespec/t_linespec.x
sumspec hlp=doc$sumspec.hlp, src=rvsao$Makespec/t_sumspec.x
velset hlp=doc$velset.hlp, src=rvsao$Util/t_velset.x
zvel hlp=doc$zvel.hlp, src=rvsao$zvel.cl
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