> i want a update function like this.
> after i updated a website,the system tells me which pages 
> are changed and which pages are deleted.and i don't what 
> save the page content in the catch file. which command 
> line should i use?
You can't - update automatically update pages that changed, 
and also delete (except if you selected the "do not purge 
old files" option) remotely deleted files.

> for mirror the website, but httrack save the page's 
> contect in the new.dat file. i relly don't want this.

If you really want to chedk changes between applying them, 
first copy a backup of the folder, and after checking hts-
log.txt (listing updated files and deleted ones), you may 
replace the backup.