tack.html">unstack</a></td>
<td>Stack or Unstack Vectors from a Data Frame or List</td></tr>
<tr><td style="width: 25%;"><a href="untar.html">untar</a></td>
<td>Extract or List Tar Archives</td></tr>
<tr><td style="width: 25%;"><a href="unzip.html">unzip</a></td>
<td>Extract or List Zip Archives</td></tr>
<tr><td style="width: 25%;"><a href="update.packages.html">update.packages</a></td>
<td>Compare Installed Packages with CRAN-like Repositories</td></tr>
<tr><td style="width: 25%;"><a href="packageStatus.h