Creating/Concatenate Strings into another String

Is there a way to do it?

For example I tried this:

args<-commandArgs()
fname <- args[6]."-".args[9]

# then I would like to create a file
# using the above created name

postscript(filename=fname)
dev.off()

But  that concatenation doesn't seem to do it.

Gundala Viswanath