system in R

 In R, system invokes the OS command specified by command.

# Now the output of the command will be written to 'stdout'
system_return_val <- system("ls ../")

cat("Retrun value of system is: ", system_return_val, "\n")

## Retrun value of system is:  0

# You can use parameter 'intern' to captur the output of the command as an R character vector
system_return_val <- system("ls ../", intern = TRUE)
cat("Retrun value of system with 'intern=T' is: ", system_return_val, "\n")

## Retrun value of system with 'intern=T' is:  donate home post publications_selected tags

intern: a logical (not ‘NA’) which indicates whether to capture the output of the command as an R character vector.