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C--------------------------------------------------------------------------
subroutine ftukyl(ounit,keywrd,logval,comm,status)
C update a logical value header record
C
C ounit i fortran output unit number
C keywrd c keyword name ( 8 characters, cols. 1- 8)
C logval l keyword value
C comm c keyword comment (47 characters, cols. 34-80)
C OUTPUT PARAMETERS:
C status i output error status (0 = ok)
C
C written by Wm Pence, HEASARC/GSFC, Oct 1994
character*(*) keywrd,comm
integer ounit,status,tstat
logical logval
if (status .gt. 0)return
tstat=status
C try modifying the keyword, if it exists
call ftmkyl(ounit,keywrd,logval,comm,status)
if (status .eq. 202)then
C keyword doesn't exist, so create it
status=tstat
call ftpkyl(ounit,keywrd,logval,comm,status)
end if
end
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