Print FITS and IRAF Image Header Keyword Values
gethead is a utility for printing FITS or IRAF header keyword values.
It parses the command line to separate file names from keywords. File names
must have the extensions .fit, .fits, .fts, .FIT, .FITS, or .FTS for FITS files
or .imh for either version 1 or version 2 IRAF files. Keyword names may be
entered in either upper or lower case; they will be automatically translated
to upper case by the program. Tab table output, with tab-separated columns
with tab-separated column headers, is an option. A list of filenames may
be used by prefacing it with a @.