rscript arguments input
#!/usr/bin/env Rscript
args = commandArgs(trailingOnly=TRUE)
# test if there is at least one argument: if not, return an error
if (length(args)==0) {
stop("At least one argument must be supplied (input file).n", call.=FALSE)
} else if (length(args)==1) {
# default output file
args[2] = "out.txt"
}