for FF:
java -jar selenium-server-standalone-2.47.1.jar -role node -hub http://localhost:4444/grid/register -browser browserName=firefox -port 5557
for Chrome :
java -jar selenium-server-standalone-2.47.1.jar -role node -hub http://localhost:4444/grid/register -browser browserName=chrome, maxInstances-4,platform=WINDOWS
which command i should use for I.E?