How to show all GNU R installed packages

To list all available that is installed packages for your GNU R installation, start 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)

Once the GNU R program started use library method to list all installed packages:

> 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)

As alredy mentioned the above command will only list available packages. To see all currently loaded packages for your current GNU R session you can use search():

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

In order to see a library path thus the filesystem location on where are all packages physically installed use .libPaths():

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

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