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