Process module:System -package:unix -package:Win32 -package:process is:module

A module adapting the functions from System.Process to work with io-streams.
Use OS processes just like native Haskell functions - to generate, transform or consume streams. See Streamly.System.Command module for a higher level wrapper over this module. See also: Streamly.Internal.System.Process for unreleased functions.
Invoking external preprocessors.