NAME

       replacekey - replace keywords in a FITS header

SYNOPSIS

       replacekey [options] <in>

DESCRIPTION

       replacekey is aimed at replacing keywords in a FITS file's header by new keywords provided
       by the user on the command-line.

ALGORITHM

       The user can provide a new_keyword, an old_keyword, a value  and  a  comment.   replacekey
       first searchs for old_keyword if provided. If it finds it, it replaces the associated card
       by the new one (new_keyword=value/comment).  If old_keyword is either  not  found  or  not
       provided,  replacekey searchs for new_keyword, and if it finds it, replaces the associated
       card by the new one (new_keyword=value/comment).  new_keyword has to be provided.

       Examples: You want to change the value of VALUE from 32 to 16 in myfile.fits: % replacekey
       -k "VALUE" -v "16" myfile.fits

       If  you  want  to replace the card with the keyword OLD by "NEW = 3.14 / This is a usefull
       key" in myfile.fits: % replacekey -k "NEW" -v "3.14" -c "This is a usefull key"  -K  "OLD"
       myfile.fits

       If  your  do  not care about the HISTORY cards you have in the header, and want to replace
       the first one by VALUE=32, you would do:
       % replacekey -k "VALUE" -v "32" -K "HISTORY" myfile.fits

OPTIONS

       -k or --key key
              To provide the new keyword.

       -K or --old key
              To provide the old keyword.

       -v or --val val
              To provide the new value.

       -c or --com com
              To provide the new comment.

SEE ALSO

       hierarch28 to convert HIERARCH ESO keywords to regular 8-char keywords.

FILES

       Files shall all comply with FITS format

BUGS

       Modifications are so far only possible in the main header, not in the extensions.

                                           28 Oct 1999                              replacekey(1)