spark-shell --master local[10]

hdfs ls

import sys.process._
val oldcksum = "cksum oldfile.txt" !!
val newcksum = "cksum newfile.txt" !!
val hdpFiles = "hdfs dfs -ls" !!

import sys.process._    # This will let underlying OS commands to be executed.
val oldhash = "certUtil -hashFile PATH_TO_FILE" !!#CertUtil is a windows command