Dear Henrik and Steven,

Thank you for your kind help and guidance even though it is a basic
question. I misunderstood that "gunzip" is a part of not "R.utils" but
"utils". I could find out the function in "R.utils". Then, it was successful
to decompress any "gz" file as follows.

library(R.utils)
gunzip("foo.gz")

Best Regards,
Wonsang

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