用DVD安装软件
mkdir -p /dist
mount -t cd9660 /dev/cd0 /dist
env REPOS_DIR=/dist/packages/repos pkg install xorg
env REPOS_DIR=/dist/packages/repos pkg install gnome3
bsdconfig
管理用户：太多年不用了，竟然 addgroup和 adduser 都被集成到 pw了。
pw addgroup
pw adduser
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