利用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
fi