code:

#!/bin/bash

# Script will ssh to two servers and do an md5sum of a file and validate
# the file is the same on both nodes.
# Also takes a list of files and will validate all of them
# Written 03/28/2016 by [email]jmjf@sa.com[/email]


. /methode/$LOGNAME/.bash_profile

HELP=false
SOURCE=""
LISTFILE=""
FILENAME=""
LOCAL_MISSING=0
TARGET_MISSING=0
MDSUM_MATCH=0
MDSUM_NOT_MATCH=0
TOTAL_FILES=0
SILENT=NO
ERROR_OUTPUT=${HOME}/tmp/verify_output.txt

while getopts l:t:f:ho:s opt
do
        case $opt in
          l)LISTFILE=$OPTARG
	   sed -i 's/\r//g' $LISTFILE;;
          t)TARGET=$OPTARG;;
          f)FILENAME=$OPTARG;;
	  s)SILENT="YES";;
          h)HELP="true";;
	  o)ERROR_OUTPUT=$OPTARG
	    echo "========================
		  Beginning Comparision 
		  $(date +%d%b%Y%H%M)
		  ========================" >> $ERROR_OUTPUT
		;;
          *)echo "Invalid arg";;
        esac
done

if [ "$HELP" == "true" ]
then
        #Invoking help
        echo "Usage: verify_migration.bash -t target_server -f /full/path/to/file_to_validate [-l /full/path/to/list_file.txt [-h] [-s]
        -t target server, must be able to ssh using key exchange
        -f /path/to/file_to_validate check one file between current node and target
        -l /path/to/list_file.txt  takes a list of files or folders to validate between current node and target, optional
                one full path and file name per line please
	-s supress line by line feedback, and just print final summary
	-o output file for errors
        -h this help
        Text ouputs in $(tput setaf 1) Red for bad results  $(tput setaf 7) and  $(tput setaf 2) green for good results $(tput setaf 7)"
fi


function check_file_type {
TYPE=""
if [ -d "$line" ]
then
	TYPE="DIRECTORY"
elif [ -f "$line" ]
then
	TYPE="REGULAR_FILE"
fi
}


function validate_file {
#Check one file

FILE_TO_CHECK=$1
#SOURCE_MD5=$(md5sum ${FILE_TO_CHECK} 2> /dev/null )
SOURCE_MD5=$(md5sum ${FILE_TO_CHECK} 2> /dev/null)
TARGET_MD5=$(ssh -o LogLevel=error $LOGNAME@$TARGET "md5sum $FILE_TO_CHECK 2> /dev/null") 
OUTPUT_COLOR=2
TOTAL_FILES=$((TOTAL_FILES+1))

if [ "$SOURCE_MD5" == "" ]
then
        SOURCE_STATUS="NOT_PRESENT"
	LOCAL_MISSING=$((LOCAL_MISSING+1))
        OUTPUT_COLOR=1
	ERROR_STATUS="ERROR"
else
        SOURCE_STATUS="PRESENT"
	ERROR_STATUS="NO_ERROR"
fi

if [ "$TARGET_MD5" == "" ]
then
        TARGET_STATUS="NOT_PRESENT"
	TARGET_MISSING=$((TARGET_MISSING+1))
        OUTPUT_COLOR=1
	ERROR_STATUS="ERROR"
else
        TARGET_STATUS="PRESENT"
	ERROR_STATUS="NO_ERROR"
fi

if [ "$SOURCE_MD5" == "$TARGET_MD5" ]
then
        MD5_STATUS="MATCH"
	ERROR_STATUS="NO_ERROR"
	MDSUM_MATCH=$((MDSUM_MATCH+1))
else
        MD5_STATUS="NO_MATCH"
	MDSUM_NO_MATCH=$((MDSUM_NO_MATCH+1))
	ERROR_STATUS="ERROR"
        OUTPUT_COLOR=1
fi
if [ "$SILENT" == "NO" ]
then
	echo "$(tput setaf $OUTPUT_COLOR)$FILE_TO_CHECK is $SOURCE_STATUS locally, is $TARGET_STATUS on $TARGET, MD5 is $MD5_STATUS$(tput setaf 7)"
fi

if [ -n "$ERROR_OUTPUT" ]
then
	if [ "$ERROR_STATUS" == "ERROR" ]
	then
		echo "$FILE_TO_CHECK is $SOURCE_STATUS locally, is $TARGET_STATUS on $TARGET, MD5 is $MD5_STATUS" >> $ERROR_OUTPUT
	fi
fi

}

#START COMPARING

#Check for one file or list

if [ "$FILENAME" == "" ] && [ "$LISTFILE" == "" ]
then
	echo "You need to set a filename or a list to check"
	exit 1
fi

if [ "$FILENAME" != "" ] && [ "$LISTFILE" != "" ]
then
	echo "You can't set both a filename and a list to check, please just set one"
	exit 1
fi


#Start comparing
#first check filenames
if [ "$FILENAME" != "" ]
then
	echo "Checking single file, $FILENAME"
        validate_file $FILENAME
        exit 0
fi

if [ "$LISTFILE" != "" ]
then
	for line in $(cat $LISTFILE)
	do
		check_file_type $line
		if [ "$TYPE" == "DIRECTORY" ]
		then
			#echo "$line is a directory, lets traverse it and check it's contents"
			for item in $(ssh -o LogLevel=error $LOGNAME@$TARGET "find $line -type f -print")
			do
				validate_file $item
			done
		else
			validate_file $line 
		fi
	done < "$LISTFILE"
fi 

echo "$TOTAL_FILES total files checked"
echo "$LOCAL_MISSING files are missing locally"
echo "$TARGET_MISSING files are missing on the target node"
echo "$MDSUM_MATCH files have matching md5sums between local and target"
echo "$MDSUM_NO_MATCH files have mismatching md5sums between local and target"

exit 0