How to determine if you have an internet connection in R -

sometimes need download data internet. on occasions has failed either because website down or because computer has lost internet connection.

question: there function in r return true/false whether connected internet?

here attempt @ parsing output ipconfig/ifconfig, suggested spacedman.

havingip <- function() {   if (.platform$os.type == "windows") {     ipmessage <- system("ipconfig", intern = true)   } else {     ipmessage <- system("ifconfig", intern = true)   }   validip <- "((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)[.]){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)"   any(grep(validip, ipmessage)) } 

with simple true/false output

> havingip() [1] true