Recodes in the quite specific faststructure format (e.g first six columns need to be there, but are ignored...check faststructure documentation (if you find any :-( )))
gl2faststructure(gl, outfile = "gl.str", probar = TRUE)
-- genlight object
-- filename of the output fastA file [default genlight.fasta]
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The script writes out the a file in faststructure format.