hostname

• /etc/hostname
• 参考
  • https://en.wikipedia.org/wiki/Hostname#Restrictions_on_valid_host_names
  • [0-9a-z][0-9a-z.-]{,254}

cat /etc/hostname
hostname

# AlpineLinux
# https://github.com/alpinelinux/alpine-conf/blob/master/setup-hostname.in
setup-hostname $HOST
# 等同于
echo "$HOST" > "$ROOT/etc/hostname"