Delete FITS and IRAF Image Header Keyword Entries
delhead is a utility for removing the entries for specified keywords
from FITS or IRAF headers.
It parses the command line to separate file names from keywords.
Files must be legal FITS or IRAF .imh (version 1 or 2) files. Keyword names
may be entered in either upper or lower case; they will be automatically
translated to upper case by the program.
A list of filenames may be used by prefacing the name of the file
containing the list with a @ or by using a wild card on the command