HowTo check files integrity via shell script

In order to control integrity of files on my fileserver I've created special script.
It walks around filesystem (in the given directory) and calculates checksums for files or checks their.
If the file has been changed after last check the warning message will be displayed.



Script:

xqx_uintegra.sh 

#!/bin/bash

#Checks files integrity via md5sum utility.
#
#For removal of all *.md5 files, execute: find -name "*.md5" -exec rm {} \;
#Usage:
#       xqx_uintegra.sh "/path/to/directory"


DATE=`date +%Y.%m.%d_%H.%M.%S.%N`
LOG=~/`basename $0`-$DATE.log
touch $LOG

if test ! -w "$LOG"; then
    LOG=/dev/stdout
fi

SHIFT=$[`tput cols`-10]
MOVE="\\033["$SHIFT"G"
DEFAULT="\\033[0;39m"
RED="\\033[1;31m"
GREEN="\\033[1;32m"
YELLOW="\\033[1;33m"
BLUE="\\033[1;34m"

logError_end() {
    echo -e "$MOVE$RED$1$DEFAULT"
    echo -e \\t$1 >>$LOG
}

logOk_end() {
    echo -e "$MOVE$GREEN$1$DEFAULT"
    echo -e \\t$1 >>$LOG
}

logWarning_end() {
    echo -e "$MOVE$YELLOW$1$DEFAULT"
    echo -e \\t$1 >>$LOG
}

checkSum() {
    #$1=file
    echo -en CheckSum:\\t$1
    echo -en CheckSum:\\t$1 >>$LOG
    file=`basename $1`
    dir=`dirname $1`
    (cd $dir && md5sum -c -- $file >/dev/null 2>&1 && logOk_end OK || logError_end ERROR)
}

calcSum() {
    #$1=file
    echo -en CalcSum:\\t$1
    echo -en CalcSum:\\t$1 >>$LOG
    file=`basename $1`
    dir=`dirname $1`
    (cd $dir && md5sum -b -- $file >$file.md5 2>/dev/null && logWarning_end CALCULATED || logError_end ERROR)
}


fin_process() {
    while read; do
        #echo $REPLY
        if test -n "`echo $REPLY | grep '\.md5$'`"; then    
            checkSum $REPLY
        else
            if test ! -f "$REPLY.md5"; then
                calcSum $REPLY
            fi
        fi
    done
}


find $1 -type f | fin_process;
echo 
echo -e "\\033[1;31m"
cat $LOG |grep ERROR
echo -e "\\033[0;39m"

This script works in Linux systems and under Cygwin environment.

Examples of usages:
In the Windows+Cygwin:
bash xqx_uintegra.sh E:/Temp/sun

In the Linux:
xqx_uintegra.sh /home/fileserver