Shell脚本监控目录内文件改动

#! /bin/bash
webroot="/home/www/"
cp /dev/null rsync_file
if [ ! -f file.md5 ];then
  find $webroot -type f -exec md5sum {} ; >>file.md5
else
  for file in $(md5sum -c file.md5|awk -F':' '/FAILED/{print $1}')
    do
      if [ -f $file ];then
      filename_z=$(echo $file|sed 's#/#/#g')
      sed -i "/ $filename_z/"d file.md5
      md5sum $file >> file.md5
      echo $file >> rsync_file
      else
      echo $file >>rsync_rm
      fi
    done
  for newfile in $(find $webroot -type f)
    do
      grep $newfile file.md5 >/dev/null 2>&1
      if [ $? -gt 0 ];then
      md5sum $newfile >> file.md5
      echo "$newfile" >> rsync_file
      fi
    done
for rfile in $(cat rsync_file)
do
rsync -avzp $rfile /home/www3/
done