shell脚本，如何监控目录下的文件内容是否被修改。

第一种方法是通过cmp来进行比对
[root@localhost bo]# ls
.html  .html  .html  .html  .html  .html  .html  .html  .html  cat.sh
[root@localhost bo]# cat cat.sh
#!/bin/bash

[ !  -f /root/wyb/bo/cat.log  ]  && cat *.html > /root/wyb/bo/cat.log
cat *.html >tmp.log

cmp tmp.log /root/wyb/bo/cat.log

[ $? -eq  ] && echo yes || echo no
[root@localhost bo]# bash cat.sh
yes
[root@localhost bo]# vi .html
[root@localhost bo]# bash cat.
cat.log  cat.sh
[root@localhost bo]# bash cat.sh
tmp.log /root/wyb/bo/cat.log differ: byte , line
no
[root@localhost bo]# 

第二种方法是通过md5来检验
[root@localhost bo]# ls
.html  .html  .html  .html  .html  .html  .html  .html  .html  cat.log  cat.sh  md5.sh  tmp.log
[root@localhost bo]# cat md5.sh
#!/bin/bash
LANG=en

dosomething()
{
 a=`grep 'FAILED' /tmp/md5.check|awk -F':' '{print $1}'`
 echo -e "\033[32m$a\033[0m changed !"
}

find_file(){

  b=`find /root/wyb/bo  -type f|xargs md5sum > /tmp/html.md5`
 echo $b

}

success()
{
echo "not change"
}

[ !  -f  /tmp/html.md5 ] && find_file
md5sum -c /tmp/html.md5 > /tmp/md5.check    >&
[ $? -eq  ] && success || dosomething

[root@localhost bo]# bash md5.sh 

not change
[root@localhost bo]# echo  >> .html
[root@localhost bo]# bash md5.sh
/root/wyb/bo/.html changed !
[root@localhost bo]#