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# 4. Starting fitsblink

`Fitsblink` can be started in the following ways:

- `fitsblink [[file.fts] [file.fts.gz]..]` will show the user interface and let you do all of the normal functions. If you specify FITS file names, it will also load images and display them.
- `fitsblink -i file.inp` will read names of the FITS files which should be loaded from the `file.inp`, their respective positional shift and any number of markers with their positions, sizes, colors and shapes.
- `starcount` where `starcount` is a link to the `fitsblink` program will detect stars and write their positions in an output file (see subsection 12.1.5). `Starcount` runs `fitsblink` in a non-interactive mode, so no windows appear nor do you need to run X-Windows.
- `catalog` where `catalog` is a link to the `fitsblink` program will read a star list and the image FITS header and try to find a match with a star catalog. It writes any cross-identifications it finds in the output file. For more details, see subsection 12.2.4.