[Haskell-cafe] Using external programs with Haskell in windows.
Donald Bruce Stewart
dons at cse.unsw.edu.au
Sat Mar 17 22:13:57 EDT 2007
> I'm looking for a way to run an external program and get the results in
> haskell. Something similar to HSH but that will work in windows. I don't
> need anything too complex, just to provide the command to be run as a
> string and get the result as a string. Is this possible?
> One of the HSH examples is all I need:
> runS $ "echo /etc/pass*"
> -> "/etc/passwd /etc/passwd-"
System.Process is your friend. E.g.
-- Run a normal shell command
run :: String -> IO String
run s = handle (fail . show) $ do
(ih,oh,eh,pid) <- runInteractiveCommand s
so <- hGetContents oh
se <- hGetContents eh
ex <- waitForProcess pid
case ex of
ExitFailure e -> fail $ "Failed with status: " ++ show e
_ | not (null se) -> fail se
| otherwise -> return so
*Process> run $ "echo *.hs"
"Main.hs Process.hs Shell.hs\n"
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