title: Unzipping and extracting file in R
body: <p>I am trying to unzip a file and transfer the contents into a mongodb collection using R. To unzip and extract the file i'm using this line:</p>
  
  <p><code>jFile = zip.file.extract(students.json, zipname = "students.zip", unzip = getOption("unzip"))</code></p>
  
  <p>But it keeps giving this error:</p>
  
  <p><code>Error in zip.file.extract(students.json, zipname = "students.zip", unzip = getOption("unzip")) : could not find function "zip.file.extract"</code></p>
  
  <p>and i have no idea why.</p>