#!/bin/bash

# Initial value used to compare.
val=0
echo "initial val=$val"
echo "-----------"

# For each file whose name starts with "DFC" and is under files/ folder do
for f in $(ls -1 files/DFC*); do
   echo "File: $f"
   # get the number from the filename
   num=$(echo $(basename $f) | cut -d. -f1|cut -c4-)
   echo "num: $num"
   # Compare it to val value
   if [ $num -gt $val ]; then
      # It's greater, so update val value and delete file.
      val=$num
      rm $f
      echo "${f} deleted."
   fi
   echo "val=$val"
   echo "--"
done

echo "-----------"
echo "###########"
echo "-----------"
echo "val=$val"