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"Hooiveld, Guido" <guido.hooiveld at="" wur.nl=""> writes: > Hi List, > > Does anyone know of a package/tool/script that allows checking the > integrity of (Affymetrix CEL) files?? [e.g. using comparisons of MD5 > checksums]? Yes, you can use the MD5 digest for such purpose. There is a CRAN package called digest which would allow you to do this from inside R. You would want to compute the digest before uploading and send both the file and the md5 sum. Then downloaders can verify. + seth -- Seth Falcon | Computational Biology | Fred Hutchinson Cancer Research Center http://bioconductor.org