runCommand -package:wai-app-static -package:io-streams -package:xmonad-contrib is:exact
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 a command within the PlotM monad. Stderr stream is read
and decoded, while Stdout is ignored. Logging happens at the debug
level if the command succeeds, or at the error level if it does not
succeed.
Run the provided command with the provided arguments.
If the command filename does not contain a slash, then the
PATH environment variable is searched for the executable.