# The `stack script` command ~~~text stack script [--package PACKAGE] FILE [-- ARGUMENT(S) (e.g. stack script X.hs -- argument(s) to program)] [--compile | --optimize] [--ghc-options OPTIONS] [--extra-dep PACKAGE-VERSION] [--no-run] ~~~ The `stack script` command also either runs a specified Haskell source file (using GHC's `runghc`) or, optionally, compiles a specified Haskell source file (using GHC) and, by default, runs it. However, unlike `stack ghc` and `stack runghc`, the command ignores all Stack YAML configuration files. A snapshot must be specified on the command line (with the `--resolver` option). For example: ~~~text stack --resolver lts-19.28 MyScript.hs ~~~ or, equivalently: ~~~text stack script --resolver lts-19.28 MyScript.hs ~~~ Everything after `--` on the command line is interpreted as a command line argument to be passed to what is run. A package can be added to the snapshot on the command line with the `--extra-dep` option (which can be specified multiple times). Each required package can be specified by name on the command line with the `--package` option (which can be specified multiple times). A single `--package` option can also refer to a list of package names, separated by a space or comma character. If the package is not in the snapshot, the most recent version on Hackage will be obtained. If no packages are specified in that way, all the required packages that are in the snapshot will be deduced by reference to the `import` statements in the source file. The `base` package associated with the version of GHC specified by the snapshot is always available. The source file can be compiled by passing either the `--compile` flag (no optimization) or the `--optimize` flag (compilation with optimization). If the file is compiled, passing the `--no-run` flag will mean the compiled code is not run. Additional options can be passed to GHC using the `--ghc-options` option. For example, `MyScript.hs`: ~~~haskell module Main (main) where import Data.List (intercalate) import System.Environment (getArgs) import Acme.Missiles (launchMissiles) main :: IO () main = do advices <- getArgs launchMissiles putStrLn $ intercalate "\n" advices ~~~ can be compiled and run, with arguments, with: ~~~text stack --resolver lts-19.28 script --package acme-missiles --compile MyScript.hs -- "Don't panic!" "Duck and cover!" ~~~