Change a unifi switch/firewall/ap from static IP to DHCP

change-from-static-to-dhcp-unifi.sh

sed -i -E 's/netconf.1.ip=.+/netconf.1.ip=0.0.0.0/g' /tmp/system.cfg
sed -i -E 's/netconf.1.netmask=.+//g' /tmp/system.cfg


sed -i -E 's/route.1.gateway=.+//g' /tmp/system.cfg
sed -i 's/route.1.status=enabled//g' /tmp/system.cfg
sed -i 's/route.1.devname=eth0//g' /tmp/system.cfg
sed -i 's/route.1.ip=0.0.0.0//g' /tmp/system.cfg
sed -i -E 's/route.1.gateway=.+//g' /tmp/system.cfg

sed -i -E 's/resolv.nameserver.1.ip=.+//g' /tmp/system.cfg
sed -i 's/resolv.nameserver.1.status=enabled/resolv.nameserver.1.status=disabled/g' /tmp/system.cfg
sed -i 's/resolv.nameserver.2.status=enabled/resolv.nameserver.2.status=disabled/g' /tmp/system.cfg


echo "dhcpc.1.status=enabled" >> /tmp/system.cfg
echo "dhcpc.1.devname=eth0" >> /tmp/system.cfg

cfgmtd -f /tmp/system.cfg -w && reboot