# We will use the new methods ReadPerference and not slaveOK. 
  # You must have ran Replication_setup.txt and Replication_setup2.txt beforehand. 

echo '
function hi() { 
  hinfo = db.runCommand("hostInfo")["system"]["hostname"];     
  print(hinfo);
}
hi();
print(db.no.count());
' > mongo/hc.js


  # Only the primary will work both times.
  # We try to print the port and the count. 
  # The count will fail on the rest, but the host and port will print.  
mongo --quiet --port 3001 mongo/hc.js
mongo --quiet --port 3002 mongo/hc.js
mongo --quiet --port 3003 mongo/hc.js
mongo --quiet --port 3004 mongo/hc.js
mongo --quiet --port 3005 mongo/hc.js
mongo --quiet --port 3006 mongo/hc.js

echo '
function hi() {
  hinfo = db.runCommand("hostInfo")["system"]["hostname"];
  print(hinfo);
}
hi();

db.getMongo().setReadPref("primaryPreferred");
print(db.no.count());
' > mongo/hc2.js

  # All should work but aritrary. Its data part should fail. 
mongo --quiet --port 3001 mongo/hc2.js
mongo --quiet --port 3002 mongo/hc2.js
mongo --quiet --port 3003 mongo/hc2.js
mongo --quiet --port 3004 mongo/hc2.js
mongo --quiet --port 3005 mongo/hc2.js
mongo --quiet --port 3006 mongo/hc2.js