Bash Shell

#!/bin/bash
clear
if [[  -z "$pn" ]]
then    
    echo "Not enough input, try again"
else
    scp -r $pn /home/masterNode/programming/MPI/
    scp -r $pn slaveNodeOne@192.168.0.201:/home/masterNode/programming/MPI/
    scp -r $pn slaveNodeTwo@192.168.0.202:/home/masterNode/programming/MPI/
    scp -r $pn slaveNodeThree@192.168.0.203:/home/masterNode/programming/MPI/
fi