#!/bin/csh -f
#PBS -l nodes=4 
printenv
pwd
cd ~/program_directory
set nodelist
set nodes=(`cat $PBS_NODEFILE`)
echo $nodes

foreach node ($nodes)
        set nodelist = ($nodelist$node'\n')
end

echo $nodelist > nodelist
/opt/mpich/bin/mpirun -np 4 -machinefile nodelist program