#!/bin/bash

VIDEO_ROOT_DIRECTORY="/Users/astrid/NFS/scripts/img2iso"

for imgfile in `find "$VIDEO_ROOT_DIRECTORY" -name "*.img" -type f`
do
   n=0
   exit=""
   suffix=""

   while [ ! "$exit" ]
   do
      newname=`echo "$imgfile" | sed "s/\.img$/$suffix\.iso/"`
      if [ ! -f "$newname" ]
      then
         mv "$imgfile" "$newname"
         exit="y"
      else
         n="$((n+1))"
         suffix="-$n"
      fi
   done
done