FQDN (Fully Qualified Domain Names) in R

By Steph Locke

This is just a quick post, to mention how you can get your computer name with the domain it is registered in i.e. Â the fully qualified domain name (FQDN) by using R.

Base R

In Windows to get the computer name in itâ€™s fully qualified form you need to do:

paste(Sys.getenv("COMPUTERNAME"),
  Sys.getenv("USERDNSDOMAIN"),
  sep=".")

## [1] "SLOCKE.MANGO.LOCAL"

In Linux, you can use:

Sys.getenv("HOSTNAME")

## [1] ""

Each of these returns an empty string in the other OS so you can concatenate them to get the FQDN.

getFQDN <- function (){
  tolower(
           paste0( paste(Sys.getenv("COMPUTERNAME"),
                        Sys.getenv("USERDNSDOMAIN"),
                        sep=".")
                 , Sys.getenv("HOSTNAME")
                 )
  )
}
getFQDN()

## [1] "slocke.mango.local"