Hello, I am trying to use createProcess. Following is a small fragment. I am trying to run a program called blastall (a bio-informatics program). It is kind of like mv/cp/ln on Unix platforms (where the executable examines the program, i.e. arg[0], and then provides appropriate behavior/semantics). In the case of blastall, it alters its behavior based on the -p(program) CLI argument.WSo in the following it should provide nucleotide behavior ... that is what the 'n' on the end of blastn means. import System.Process main = do handle <- runProcess "blastall" -- executable ["-p blastn"] -- CLI args Nothing -- optional cwd Nothing -- optional env Nothing -- optional stdin Nothing -- optional stdout Nothing -- optional stderr return () When I run this program with ghci, blastall is not a happy camper. It is complaining about "-p blastn": [NULL_Caption] ERROR: Program name undefined: " blastn" <<< the space between the double quote and 'b' is really there!!! [NULL_Caption] ERROR: Program name undefined: " blastn" Yet if I run 'blastall -p blastn' from the DOS prompt no errors(I will try tonight on my Linux machine). If I try 'blastall -p bozo" from the DOS prompt I get the same two errors as when I run my test program using ghci. I feel that it has something to do with double quotes in Haskell ... probably something obviously silly that I am doing. Any ideas? Kind regards, Vasili