A script for sharing an internet connection in Linux, everyday it will use a wpa_supplicant conf

internet.sh

#!/bin/bash
PATH=/home/aaron/bin:/home/aaron/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

wlan="wlp1s0"
en="enp2s0"

# Array of confs
wpa_confs[0]="/home/aaron/wifi/wpa_aaron.conf"
#wpa_confs[0]='wpa_empty.conf'
nconfs=${#wpa_confs[@]}

DD=$(date +%d)
index=$((DD%nconfs))
conf=${wpa_confs[$index]}

echo "Using conf: $conf"

# select new conf
cp "$conf" /etc/wpa_supplicant/wpa_supplicant.conf
#wpa_supplicant -B -i "$wlan" -c /etc/wpa_supplicant/wpa_supplicant.conf
wpa_cli reconfigure

echo "Restarting WLAN interface..."
ip addr flush dev "$wlan"
ifconfig "$wlan" down

# Use antenna 0 in 1x1
iw phy phy0 set antenna 1 1

ifconfig "$wlan" up
#service networking restart
#/etc/init.d/networking restart
# get new dhcp lease

echo "Requesting DHCP lease..."

dhclient "$wlan"

# Share interface
sysctl -w net.ipv4.ip_forward=1


echo "Configuring NAT..."
iptables -t nat -A POSTROUTING -o $wlan -j MASQUERADE
iptables -A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i $en -o $wlan -j ACCEPT