详见GitHub上的一个开源项目：
https://github.com/oblique/create_ap

在树莓派上具体操作步骤为：

1.将代码copy到本地，安装

git clone https://github.com/oblique/create_ap
cd create_ap
sudo make install

2.安装依赖的库

sudo apt-get install util-Linux procps hostapd iproute2 iw haveged dnsmasq

若安装不上，请先执行

sudo apt-get update

3.创建WiFi热点

sudo create_ap wlan0 eth0 热点名 密码

例如：

sudo create_ap wlan0 eth0 yuntai_pi 12345678

4.开机启动

将步骤3中创建WiFi热点的命令添加到/etc/rc.local当中，保存，然后reboot重启

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
sudo create_ap wlan0 eth0 yuntai_pi 12345678
# Print the IP address
_IP=$(hostname -I) || true
if [ "$_IP" ]; then
  printf "My IP address is %s\n" "$_IP"
fi

exit 0