runCommand -package:wai-app-static -package:graphviz -package:pandoc-plot -package:shake -package:mongoDB -package:cabal-install -package:quickcheck-state-machine -package:options -package:process -package:shake-plus is:exact

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.