檔案比對

1. 先找出目錄 include 下有修改過的檔案。

   [root@mail squirrelmail-1.4.8]# diff --ignore-all-space -qr . /var/www/squirrelmail/ | grep "Files \./include" | sort
   Files ./include/load_prefs.php and /var/www/squirrelmail/include/load_prefs.php differ
   Files ./include/options/personal.php and /var/www/squirrelmail/include/options/personal.php differ
   Files ./include/validate.php and /var/www/squirrelmail/include/validate.php differ