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       keyhead - Change FITS or IRAF header keyword names


       sethead [-hknv] <FITS or IRAF file> kw1=kw1a kw2=kwd2a ... kwn=kwdna


       Change  the  names  of keywords in FITS or IRAF image headers.  Each current image keyword
       whose entry is to be modified should be followed by an equal sign and  a  second  keyword,
       with  no intervening spaces.  If the -r option is used, the value of the second keyword is
       transferred to that of the first. Otherwise, the name of the first keyword is  changed  to
       the second keyword.  To change keywords in a list of files, substitute @<listfile> for the
       file names on the command line.  To change a lot of keywords, put them, one pair separated
       by  an  =  sign  with  no  spaces per line, in a file and substitute @<keylistfile> on the
       command line.  If two @ commands are present, the program will figure out  which  contains
       file names and which contains keywords.  Lines in a keyword list file which do not contain
       an = are ignored.


       -h     Write HISTORY line into output header with sethead version, current date and  time,
              and names of keywords set.

       -k     Write KEYHEAD keyword into output header with the keyhead version, current date and
              time, and names of keywords whose names are changed.  If a KEYHEAD keyword  already
              exists, move the old value to a HISTORY line before writing the new value

       -n     Write a new file with an added "e" before the extension.

       -r letter
              Replace value of 1st keyword with value of 2nd keyword instead of changing the name
              of the 1st keyword to the 2nd keyword.  The 2nd keyword remains in the header.   If
              the 1st keyword does not exist in the header, it is created.

       -v     Print confirmations of each keyword change.

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       Jessica Mink, SAO (