Raspberry Pi 3 access-point-setup

Raspberry-AP-Setup.sh

#!/bin/bash
#
# This version uses Debian Stretch, please use that version.
# Usage: curl -sSL https://gist.githubusercontent.com/aceisace/b53e93924c969ac47e2333e970c132b0/raw/b4fbeed6cbe74d306c1951dc03435b38132b034e/Raspberry-AP-Setup.sh | bash

echo -p "Please enter a SSID for your AP, followed by [ENTER]:"
read APSSID
echo "Your AP will be named $APSSID"

echo -p "Please enter a password for your AP, followed by [ENTER]:"
read APPASS
echo "Your AP password has been saved"


echo -e "\e[1;36m"Getting the system ready..."\e[0m"
echo -e "\e[1;36m"This may take a while..."\e[0m"
sudo apt-get remove --purge hostapd -yqq
sudo apt-get update -yqq
#sudo apt-get dist-upgrade -yqq
sudo apt-get install hostapd dnsmasq -yqq
echo -e "\e[1;36m"All right, the system is up to date"\e[0m"

echo -e "\e[1;36m"Editing dnsmasq.conf file..."\e[0m"
sudo cat > /etc/dnsmasq.conf <<EOF
interface=wlan0
dhcp-range=192.168.4.2,192.168.4.20,255.255.255.0,24h
EOF

echo -e "\e[1;36m"Editing the hostapd.conf file..."\e[0m"
sudo cat > /etc/hostapd/hostapd.conf <<EOF
interface=wlan0
ssid=$APSSID
hw_mode=g
channel=6
wmm_enabled=1
macaddr_acl=0
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=$APPASS
wpa_key_mgmt=WPA-PSK
wpa_pairwise=CCMP
rsn_pairwise=CCMP
ieee80211n=1
ht_capab=[HT40][SHORT-GI-20][DSSS_CCK-40]
EOF

echo -e "\e[1;36m"Modifying the interfaces file"\e[0m"
sudo sed -i -- 's/allow-hotplug wlan0//g' /etc/network/interfaces
sudo sed -i -- 's/iface wlan0 inet manual//g' /etc/network/interfaces

echo -e "\e[1;36m"Editing wpa_supplicant.conf and hostapd..."\e[0m"
sudo sed -i -- 's/    wpa-conf \/etc\/wpa_supplicant\/wpa_supplicant.conf//g' /etc/network/interfaces
sudo sed -i -- 's/#DAEMON_CONF=""/DAEMON_CONF="\/etc\/hostapd\/hostapd.conf"/g' /etc/default/hostapd

echo -e "\e[1;36m"Adding a few IP addresses in the interfaces file..."\e[0m"
sudo cat >> /etc/network/interfaces <<EOF
# Added by Access Point Setup
allow-hotplug wlan0
iface wlan0 inet static
	address 192.168.4.1
	netmask 255.255.255.0
	network 192.168.4.0
	
EOF

sudo echo "denyinterfaces wlan0" >> /etc/dhcpcd.conf

echo -e "\e[1;36m"Starting and enabling hostapd and dnsmasq"\e[0m"
sudo systemctl enable hostapd
sudo systemctl enable dnsmasq

sudo service hostapd start
sudo service dnsmasq start

echo "All done! Please reboot to apply changes"