System.Plex.ByteString

Execute a command, redirect stderr into stdout, and return the combined result (optionally, with a timeout).

Documentation

readCommand :: FilePath -> [String] -> IO (ProcessID, IO ByteString)

readCommand command args: given a command to run in a subprocess, and args to pass to it -- return the childPid of the subprocess, and a function for reading its output.

if it doesn't start with a forward-slash, the command is searched for in the current path.

cmd :: FilePath -> [String] -> IO ByteString

cmd command args: execute command with args; read combined stdout and stderr; return it as a string If there is an error executing the command, it'll get caught and a Haskell error message will get printed.

cmdTimeout :: FilePath -> [String] -> Int -> IO (Maybe ByteString)

same as command, but with a timeout. Hard to get it do return nicely with timeout < about 10^5 microsecs