NAME

       fitscheck - script to detect and fix FITS standards violations

SYNOPSIS

       fitscheck [OPTION]... [FILE]...

DESCRIPTION

       fitscheck is a command line script based on pyfits for verifying and updating the CHECKSUM
       and DATASUM keywords of FITS files.  itscheck can also detect and  often  fix  other  FITS
       standards   violations.   fitscheck  facilitates  re-writing  the  non-standard  checksums
       originally generated by pyfits  with  standard  checksums  which  will  interoperate  with
       cfitsio.

       fitscheck will refuse to write new checksums if the checksum keywords are missing or their
       values are bad.  Use --force to write new checksums regardless  of  whether  or  not  they
       currently  exist  or  pass.   Use  --ignore-missing  to tolerate missing checksum keywords
       without comment.

OPTIONS

       -h, --help
              Display terse usage information (help).

       -k [standard | nonstandard | either | none], --checksum=[standard | nonstandard | either |
       none]
              Choose FITS checksum mode or none. Defaults to standard.

       -w, --write
              Write out file checksums and/or FITS compliance fixes.

       -f, --force
              Do file update even if original checksum was bad.

       -c, --compliance
              Do FITS compliance checking, fix if possible.

       -i, --ignore-missing
              Ignore missing checksums.

       -v, --verbose
              Generate extra output.

EXAMPLES

       % fitscheck --checksum either --write *.fits
       Verify  and  update  checksums,  tolerating  non-standard  checksums, updating to standard
       checksum.

       % fitscheck --write --force *.fits
       Write new checksums, even if existing checksums are bad or missing.

       % fitscheck --compliance *.fits
       Verify standard checksums and FITS compliance without changing the files.

       % fitscheck --checksum nonstandard *.fits
       Verify original nonstandard checksums only.

       % fitscheck --checksum none --compliance --write *.fits
       Only check and fix compliance problems,  ignoring checksums.

       % fitscheck *.fits
       Verify standard interoperable checksums.

       % fitscheck --checksum none --write *.fits
       Delete checksum keywords.