Does that work in R?
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I have download a dataset from GEO i.e in TAR file format. I don't know how to open that data in R.
Use the function untar in R
Extract the contents of the tar file first?
tar -xzf "filename.tar.gz"
And this is not a bioinformatical question. A simple google search of 'tar files' would've explained it.
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GEO is a big data archive, depending on what kind of file you have downloaded, its better to pre-process (extract/sanity check) on command line and then proceed to R. If you are doing it routinely, better is check SRAdb pakage.
Using the SRAdb Package to Query the Sequence Read Archive