run command for grunt

                 Key: PIG-574
             Project: Pig
          Issue Type: New Feature
          Components: grunt
            Reporter: David Ciemiewicz
            Priority: Minor

This is a request for a "run file" command in grunt which will read a script 
from the local file system and execute the script interactively while in the 
grunt shell.

One of the things that slows down iterative development of large, complicated 
Pig scripts that must operate on hadoop fs data is that the edit, run, debug 
cycle is slow because I must wait to allocate a Hadoop-on-Demand (hod) cluster 
for each iteration.  I would prefer not to preallocate a cluster of nodes 
(though I could).

Instead, I'd like to have one window open and edit my Pig script using vim or 
emacs, write it, and then type "run myscript.pig" at the grunt shell until I 
get things right.

I'm used to doing similar things with Oracle, MySQL, and R. 

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