misc.rmd

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title: Other components
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# Other components {#misc}

There are three other directories that are valid top-level directories, but are rarely used:

* `exec/`: for executable scripts. Compared to other directories, files in 
  `exec/` are automatically flagged as executable.

* `po/`: translations for error messages. This is useful but beyond the scope 
  of this book. See the [Internationalization][internationalization] chapter of 
  "R extensions" for more details.

* `tools/`: auxilary files needed during configuration, or for sources needed
  to generate scripts.

[internationalization]:http://cran.rstudio.com/doc/manuals/r-devel/R-exts.html#Internationalization