Linux shell command monitor does not seem to do anything

Hi,  We have configured a linux shell command 2 state monitor on SCOM SP1, to run a quick command on a mongodb server.  The monitor is disabled in general but enabled for  a single mongodb test server.  

The shell command is:

mongo admin --eval "printjson(db.runCommand( { replSetGetStatus : 1 } ))" | grep "state"

results in :

                        "state" : 1,
                        "stateStr" : "PRIMARY",
                        "state" : 2,
                        "stateStr" : "SECONDARY",
                        "state" : 2,
                        "stateStr" : "SECONDARY",

This server is a linux box so i have limited access to the box for testing.  In the health explorer on the mongodb test server, it shows the monitor as healthy.  

in the monitor error expression I have set  //*[local-name()="StdOut"]  contains   error

in the monitor healthy expression I have set //*[local-name()="StdOut"]  contains  errorlog
    

So clearly this monitor should be in an error condition based on the shell command results.

I am not sure if the shell command is running or not.  

How can I see if the shell command is running and what it is producing for this linux shell command monitor?

Thanks Lance