From: Greg Russell on
"PengYu.UT(a)gmail.com" <pengyu.ut(a)gmail.com> wrote in message
news:97e57379-c90a-4618-97e1-586ef007c7e9(a)z28g2000vbl.googlegroups.com...

> I see that some packages are installed in /opt? I am wondering what
> 'opt' stands for? What packages shall be installed in /opt?

File packages that are optional to the system. Many systems create
/usr/local/ for the same purpose.