fiheader - reading and manipulating FITS header keywords

       Copyright © 1996, 2002, 2004-2008, 2010-2016, 2018-2020; Pal, Andras <apal@szofi.net>

fiheader 0.9.4 (2021.01.24)                       January 2021                                       FIHEADER(1)

       This  program allows the user to read, set, alter or remove a set of values associated with the specified
       keywords from the primary header unit (a.k.a. simply "header") of a FITS image file.

       fiheader - reading and manipulating FITS header keywords

Generaloptions:-h, --help
              Gives general summary about the command line options.

       --long-help, --help-long
              Gives a detailed list of command line options.

       --wiki-help, --help-wiki, --mediawiki-help, --help-mediawiki
              Gives a detailed list of command line options in Mediawiki format.

       --version, --version-short, --short-version
              Gives some version information about the program.

       -i, --input <image file>
              Name of the input FITS image file.

       -o, --output <image file>
              Name of the output FITS image file (can be the same as the input image file).

   Readkeywordvalues:-g, --get, --read <keyword>,...
              List of keywords to get from FITS header.

       -F, --format <format>
              Format of the output, space separated  list  of  the  arguments  "filename",  "keyword",  "value",
              "comment"  or  "list",  in the desired order. The "list" here is a list of tab-separated values of
              matched keywords.

       -x, --extension <extension>
              Read keyword values from the given extension.

       Note that shell wildcard character patterns can be used in the keyword specifications.

   AlteringFITSheaders:-s, --set, --update <keyword>=<value>[/<comment>],...
              List of keywords with their new values (and optional comments) to be altered.

       -a, --append <keyword>=<value>[/<comment>],...
              List of keywords with their new values (and optional comments) to be appended to the existing list
              of keywords.

       -d, --delete <keyword>,...
              List of keywords to be removed from the header.

       --force-alter-reserved-keywords
              Enable to alter reserved FITS keywords (use with caution).

       -w, --rewrite
              Re-write the input file(s) directly. Use this option exclusively from -o|--output.

       Report bugs to <apal@szofi.net>, see also https://fitsh.net/.

fiheader [opions] [input] [-o|--output<output>]