[task #15821] Option to copy full header keywords from input into output

[Mohammad Akhlaghi]

URL:
  <https://savannah.gnu.org/task/?15821>

                 Summary: Option to copy full header keywords from input into
output
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Wed 25 Nov 2020 10:48:12 PM UTC
         Should Start On: Wed 25 Nov 2020 12:00:00 AM UTC
   Should be Finished on: Wed 25 Nov 2020 12:00:00 AM UTC
                Category: Fits
                Priority: 5 - Normal
              Item Group: Enhancement
                  Status: None
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00

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Details:

Currently there is no easy way in the Fits program
<http://www.gnu.org/software/gnuastro/manual/html_node/Fits.html> to
identically copy multiple keywords from one FITS file/HDU into another
file/HDU. 

There was a simple example with '--asis' for copying one keyword. But not
many. So in Commit d5542488
<http://git.savannah.gnu.org/cgit/gnuastro.git/commit/?id=d5542488> I just
added an example to use '--asis' for many keys. 

Further more, I just added an implementation of that example in copy-keys.sh
<https://gitlab.com/makhlaghi/useful-scripts/-/blob/master/copy-keys.sh> (in
my Useful scripts <https://gitlab.com/makhlaghi/useful-scripts> project, for
things I haven't yet had time to implement in Gnuastro!). 

But this is much easier/faster done inside the FITS program. With this task, I
am proposing to add an option like '--keytoout' for this job that is called
like below. In that command, the 'KEYA' and 'KEYB' of 'input.fits' will be
copied directly into the 'out.fits' (HDU 1). 


astfits input.fits --keytoout=KEYA,KEYB --output=out.fits --outhdu=1





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