runCommand -package:wai-app-static -package:libmpd -package:shake-plus -package:mongoDB is:exact -package:process -package:cabal-install -package:io-streams -package:pandoc-plot -package:graphviz

Either calls the given continuation, prints help text and calls exitSuccess, or prints an error and calls exitFailure. See runSubcommand for details on subcommand support.
Runs a command using the shell.
Given a list of command/action pairs, prompt the user to choose a command using dmenu and return the corresponding action.