Re-enable wifi on Raspberry Pi Buster after rfkill nukes it

enable_wifi.bash

#! /bin/bash
# RaspberryOS Buster introduced rfkill which will shut off your wifi. It reports
# that you need to set the country for it, which is fair, but apparently it has
# issues noticing that your country is, indeed, set, so the wifi stays off.
# 
# The following script checks to see if the `wlan` is blocked (well, if it's 
# not unblocked), and unblocks it. Since the rfkill check happens after reboot,
# we need to delay a bit before we start checking. 
# (e.g. in crontab:
# ```
# PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/sbin
# @reboot $HOME/bin/enable_wifi.sh reboot >> /tmp/enable_wifi.log
# ```
#
# if you want my kind of paranoia, I'd recommend running this every 5 minutes.
# ```
# */5 * * * * $HOME/bin/enable_wifi.sh >> /tmp/enable_wifi.log
# ```
#)

if [ "$1" == "reboot" ]
then
  # Sleep for around 30 seconds to let things boot and rfkill to kill your wifi. 
  # (Sigh heavily at this).
  sleep 30
fi
# Get the wifi state as rfkill knows it. This is GREATLY trimmed down.
state=`/usr/sbin/rfkill -n --output=type,soft | grep wlan`
echo $state
# Can't search for "blocked" because it's not unique enough.
if [ "`echo $state | grep -v 'unblocked' `" != "" ]
then
  echo "restarting wifi"
  /usr/sbin/rfkill unblock wlan
  echo "wifi restarted"
fi

thank you very much! 👍 🙏