R Reading in a zip data file without unzipping it

No need to use unz, as now read.table can handle the zipped file directly:

data <- read.table("Sales.zip", nrows=10, header=T, quote="\"", sep=",")

See this post

If your zip file is called Sales.zip and contains only a file called Sales.dat, I think you can simply do the following (assuming the file is in your working directory):

data <- read.table(unz("Sales.zip", "Sales.dat"), nrows=10, header=T, quote="\"", sep=",")