Disable printing of column headers in ps calls

priv/templates/simplenode.runner

@@ -69,12 +69,12 @@ case "$1" in
         case `uname -s` in
             Linux|Darwin|FreeBSD|DragonFly|NetBSD|OpenBSD)
                 # PID COMMAND
-                PID=`ps ax -o pid -o command|\
+                PID=`ps ax -o pid= -o command=|\
                     grep "$RUNNER_BASE_DIR/.*/[b]eam.smp"|awk '{print $1}'`
                 ;;
             SunOS)
                 # PID COMMAND
-                PID=`ps -ef -o pid -o args|\
+                PID=`ps -ef -o pid= -o args=|\
                     grep "$RUNNER_BASE_DIR/.*/[b]eam.smp"|awk '{print $1}'`
                 ;;
             CYGWIN*)