fits-column-merge -V (return code: 255)
fits-column-merge: invalid option -- '-'
fits-column-merge -h (return code: 0)
This program is part of the Astrometry.net suite.
For details, visit http://astrometry.net.
Git URL https://github.com/dstndstn/astrometry.net
Revision 0.72, date Mon_Jul_10_14:37:28_2017_-0400.
fits-column-merge [options] <input-file-1> <input-file-2> <output-file>
Options:
[-s]: suffix to add for duplicate column names in table 2