NAME

       Fits - view and manipulate FITS headers

SYNOPSIS

       astfits [OPTION...] ASTRdata

DESCRIPTION

       Fits  is  part  of GNU Astronomy Utilities 0.16.  Fits allows you to view and manipulate (add, delete, or
       modify) FITS extensions (or HDUs) and FITS header keywords within one extension.

       For more information, please run any of the following commands. In particular the second contains a  very
       comprehensive  explanation  of Fits's invocation: expected input(s), output(s), and a full description of
       all the options.

       All options and their values:
              $ astfits -P

       Inputs/Outputs and options:
              $ info astfits

       Full section in manual/book:
              $ info Fits

       Full Gnuastro manual/book:
              $ info gnuastro

       If you couldn't find your answer in the manual, you can get direct help from experienced  Gnuastro  users
       and developers. For more information, please run:

              $ info help-gnuastro

       Fits options:

              Input:

       -h, --hdu=STR/INT
              Extension name or number of input data.

              Output:

       -K, --keepinputdir
              Keep input directory for automatic output.

       --outhdu=STR
              HDU/extension in output for --copykeys.

       -o, --output=STR
              Output file name (only for writing HDUs).

       -O, --colinfoinstdout
              Column info/metadata when printing to stdout.

       --tableformat=STR
              Table fmt: 'fits-ascii', 'fits-binary', 'txt'.

              HDU (extension) information:

       --datasum
              Calculate HDU's datasum and print in stdout.

       --hasimagehdu
              File has at least one image HDU.

       --hastablehdu
              File has at least one table HDU.

       --listallhdus
              List all HDUs within the file.

       --listimagehdus
              List all image HDUs within the file.

       --listtablehdus
              List all table HDUs within the file.

       -n, --numhdus
              Print number of HDUs in the given FITS file.

       --pixelscale
              Return the pixel-scale of the HDU's WCS.

       --skycoverage
              Image coverage in the WCS coordinates.

              HDU (extension) manipulation:

       -C, --copy=STR
              Copy extension to output file.

       -k, --cut=STR
              Copy extension to output and remove from input.

       --primaryimghdu
              Copy/cut image HDUs to primary/zero-th HDU.

       -R, --remove=STR
              Remove extension from input file.

              Keywords (in one HDU):

       -a, --asis=STR
              Write value as-is (may corrupt FITS file).

       --copykeys=INT:INT
              Range of keywords to copy to output HDU.

       -c, --comment=STR
              Add COMMENT keyword, any length is ok.

       -d, --delete=STR
              Delete a keyword from the header.

       -H, --history=STR
              Add HISTORY keyword, any length is ok.

       -l, --keyvalue=STR[,STR,...]
              Only print the value of requested keyword(s).

       --printkeynames
              Print all keyword names.

       -p, --printallkeys
              Print all keywords in the selected HDU.

       -r, --rename=STR,STR
              Rename keyword, keeping value and comments.

       -s, --datetosec=STR
              FITS date to sec from 1970/01/01T00:00:00

       -t, --date
              Set the DATE keyword to the current time.

       -u, --update=STR,STR
              Update a keyword value or comments.

       -v, --verify
              Verify the CHECKSUM and DATASUM keywords.

       --wcscoordsys=STR
              Convert WCS coordinate system.

       --wcsdistortion=STR
              Convert WCS distortion to another type.

       -w, --write=STR
              Write a keyword (with value, comments and units).

              Operating modes:

       -?, --help
              give this help list

       --checkconfig
              List all config files and variables read.

       --cite BibTeX citation for this program.

       --config=STR
              Read configuration file STR immediately.

       --lastconfig
              Do not parse any more configuration files.

       --minmapsize=INT
              Min. bytes to avoid RAM automatically.

       --onlyversion=STR
              Only run if the program version is STR.

       -P, --printparams
              Print parameter values to be used and abort.

       --quietmmap
              Don't print mmap'd file's name and size.

       -q, --quiet
              Only report errors, remain quiet about steps.

       -Q, --quitonerror
              Quit if there is an error on any action.

       -S, --setdirconf
              Set default values for this directory and abort.

       --usage
              give a short usage message

       -U, --setusrconf
              Set default values for this user and abort.

       -V, --version
              print program version

       Mandatory  or  optional  arguments  to  long options are also mandatory or optional for any corresponding
       short options.

       GNU Astronomy Utilities home page: http://www.gnu.org/software/gnuastro/

REPORTING BUGS

       Report bugs to bug-gnuastro@gnu.org.

COPYRIGHT

       Copyright © 2015-2021, Free Software Foundation, Inc.  License GPLv3+: GNU General public license version
       3 or later.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to  the  extent
       permitted by law.

       Written/developed by Mohammad Akhlaghi

SEE ALSO

       The  full  documentation  for  Fits is maintained as a Texinfo manual.  If the info and Fits programs are
       properly installed at your site, the command

              info Fits

       should give you access to the complete manual.

GNU Astronomy Utilities 0.16                      October 2021                                           FITS(1)