Parsing the StdOut from a linux shell command in SCOM 2012 SP1

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",

How can I parse this text after it comes back to scom so I can look specifically at the state values?   I heard this is a way to do this with powershell in the linux shell command monitor but not sure how its done.

Thanks in advance

Thanks Lance