--- /dev/null
+#!/bin/bash
+#PBS -l nodes=1,mem=20m
+#PBS -M my-email@whereiwork.com
+
+##PBS -l ncpus=2
+##PBS -l nodes=4
+##PBS -l select=4:ncpus=1
+
+echo here is the nodefile:
+cat $PBS_NODEFILE
+
+echo here is pbs envir variable:
+echo $PBS_ENVIRONMENT