fitshdr - FITS-file headers manipulation tool fitshdr [options] [FITSfile_name] . ... fitshdr [options] --edit FITSfile_name . ... If You want to modify headers of FITSFILE using new FITS-header lines from HEADER file (or from stdin), You have to use this option (You can skip this option, if -H or --header option is used). ... Empty header lines are not displayed (in 'dump' mode only). --line-offsets . ... In 'dump' mode: file offset will be displayed for each header line. --no-line-offsets . ...