/usr/lib/iraf/extern/rvsao/rvsao.msg 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.
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# RVSAO Radial Velocity Analysis Package |
# Smithsonian Astrophysical Observatory |
# Telescope Data Center |
# Version 2.8.3 March 27, 2015 |
#-----------------------------------------------------------+
|