title: Where is user's cron job stored after "crontab -e"?
body: <p>I'm root, and I saw there are a lot of contents in <code>/etc/crontab</code>, which I thought is the root's cron job configurations. When I use <code>crontab -e</code>, I saw nothing in the editor; after I quit <code>crontab -e</code>, what I added was not found in <code>/etc/crontab</code>. So, where is root's cron job configuration stored? And other users?</p>