[R] performing script on multiple files

[Jonas Josefsson]

say that I have a script that uses read.csv to read a textfile in a 
certain directory, then transforming the data a bit and then spit out a 
new file in an output directory.
Is it possible to make this universal so the same procedure is made for 
all files in a certain directory and also make it spit out files that 
changes names for each file that is made (so the same output.csv is not 
overwritten every time the script runs)?