#fetch http://people.freebsd.org/~cperciva/freebsd-update-upgrade.tgz
#tar -xf freebsd-update-upgrade.tgz
#sh freebsd-update.sh -f freebsd-update.conf -r 6.3-RELEASE upgrade
#sh freebsd-update.sh -f freebsd-update.conf install
#shutdown -r now
#sh freebsd-update.sh -f freebsd-update.conf install
#shutdown -r now
#uname -a 查看系统信息