FreeBSD:Upgrade
https://www.freebsd.org/releases/12.2R/installation/#upgrade
freebsd-update fetch
uname -a
freebsd-update upgrade -r 12.2-RELEASE
freebsd-update install
shutdown -r now
# 注意重启后还需要install一下
freebsd-update install
https://www.freebsd.org/releases/12.2R/installation/#upgrade
freebsd-update fetch
uname -a
freebsd-update upgrade -r 12.2-RELEASE
freebsd-update install
shutdown -r now
# 注意重启后还需要install一下
freebsd-update install