runCommand -package:wai-app-static -package:io-streams -package:libmpd -package:xmonad-contrib -package:pandoc-plot -package:shake-plus

Runs a command using the shell.
Run an external command on the specified DotRepr. Remember to use hSetBinaryMode on the Handle for the output function if necessary. If the command was unsuccessful, then a GraphvizException is thrown. For performance reasons, a temporary file is used to store the generated Dot code. As such, this is only suitable for local commands.
Run command against the database and return its result
Retrieve getArgs, and attempt to parse it into a valid value of an Options type plus a list of left-over arguments. The options and arguments are then passed to the provided computation. If parsing fails, this computation will print an error and call exitFailure. If parsing succeeds, and the user has passed a --help flag, and the developer is using the default help flag definitions, then this computation will print documentation and call exitSuccess. See runSubcommand for details on subcommand support.
runCommand1 foo = runCommand [foo =: 1]
Called before a command is about to run. The first argument is the step index and the second is a string representing the command about to be run.
Default to True. Should you run command line actions, set to False to skip actions whose output streams and exit code are not used. Useful for profiling the non-command portion of the build system.