要列出已安装GNU R安装的软件包的所有可用，请启动GNU R：

$R
R version 3.0.2 (2013-09-25) -- "Frisbee Sailing"
Copyright (C) 2013 The R Foundation for Statistical Computing
Platform: x86_64-redhat-linux-gnu (64-bit)

使用Library方法来列出所有已安装的软件包：

> library()
Packages in library ‘/usr/local/R-packages’:
ada                     ada: an R package for stochastic boosting
amap                    Another Multidimensional Analysis Package
arules                  Mining Association Rules and Frequent Itemsetsde
...
utils                   The R Utils Package
zoo                     S3 Infrastructure for Regular and Irregular
                        Time Series (Z's ordered observations)

查看当前当前加载的软件包，我们可以使用search()：

> search()
[1] ".GlobalEnv"        "package:stats"     "package:graphics" 
[4] "package:grDevices" "package:utils"     "package:datasets" 
[7] "package:methods"   "Autoloads"         "package:base"

为了看到库路径，因此文件系统位置在物理上安装的所有包使用的位置.libpaths()：

> .libPaths()
[1] "/usr/local/R-packages" "/usr/lib64/R/library"  "/usr/share/R/library"