Script to diff files between two remote servers

diffRemote.sh

#!/bin/bash

function showHelp ()
{

	  echo "usage: $0 -d -f FILE_PATTERN HOST1:PATH1 HOST2:PATH2"
	  echo "-d: Show file diffs"
	  echo "-D DIFF_OPTIONS: provide custom options to file diffs"
	  echo "-f FILE_PATTERN: restrict comparison to files matching given glob"
	  exit 1;

}

FILEPAT="*"
DIFF=0
DIFFOPTS=""

while getopts "D:dhf:" opt; do 
  case $opt in
      D)
	  DIFFOPTS=$OPTARG
	  ;;
      d)
	  DIFF=1
	  ;;
      f)
	  FILEPAT=$OPTARG
	  ;;
      h)
	  showHelp
	  ;;
      \?)	  
	  echo "Invalid option: -$OPTARG" >&2
	  exit 1
	  ;;
#      :)
#	  echo "Option -$OPTARG requires an argument." >&2
#	  exit 1
#	  ;;
  esac
done

shift $(($OPTIND - 1))

OLD=$1
NEW=$2

OLDHOST=`echo $OLD | awk -F ':' '{print $1}'`
OLDPATH=`echo $OLD | awk -F ':' '{print $2}'`

NEWHOST=`echo $NEW | awk -F ':' '{print $1}'`
NEWPATH=`echo $NEW | awk -F ':' '{print $2}'`

if [ -z "$OLDHOST" ] || [ -z "$OLDPATH" ] || [ -z "$NEWHOST" ] || [ -z "$NEWPATH" ]; then
    showHelp
fi

OLDCOMMAND="cd $OLDPATH; find -name \"$FILEPAT\" -type f -exec md5sum {} \; | awk '{print \$2,\$1}' |sort"

OLDFILELIST=`ssh $OLDHOST "$OLDCOMMAND"`

NEWCOMMAND="cd $NEWPATH; find -name \"$FILEPAT\" -type f -exec md5sum {} \; | awk '{print \$2,\$1}' |sort"

NEWFILELIST=`ssh $NEWHOST "$NEWCOMMAND"`

DIFFS=`diff -W 2048 --suppress-common-lines -y <(echo "$OLDFILELIST") <(echo "$NEWFILELIST")`

OIFS="${IFS}"
NIFS=$'\n'
IFS="${NIFS}"

for LINE in ${DIFFS}; do

    IFS="${OIFS}"

    COLS=( $LINE )

    if [ "${COLS[0]}" = ">" ]; then
	CHANGE="${COLS[0]}"
	FILE="${COLS[1]}"
    else
	CHANGE="${COLS[2]}"
	FILE="${COLS[0]}"
    fi

    case $CHANGE in
	"|")
	    echo "$FILE differs"
	    if [ "$DIFF" -eq 1 ]; then
		echo -e '-------------------------------------------'        
		diff $DIFFOPTS  <(ssh $OLDHOST "cd $OLDPATH; cat $FILE") <(ssh $NEWHOST "cd $NEWPATH; cat $FI
LE")

	    fi
	    ;;
	"<")
	    echo "$FILE only exists on $OLDHOST"
	    ;;
	">")
	    echo "$FILE only exists on $NEWHOST"
	    ;;
    esac
    IFS="${NIFS}"
    echo -e '\n'
done

exit 0