Use consistent bash5 style for conditionals and quoting

install/config/hardware/set-wireless-regdom.sh

@@ -1,13 +1,13 @@
 # First check that wireless-regdb is there
-if [ -f "/etc/conf.d/wireless-regdom" ]; then
+if [[ -f "/etc/conf.d/wireless-regdom" ]]; then
   unset WIRELESS_REGDOM
   . /etc/conf.d/wireless-regdom
 fi
 
 # If the region is already set, we're done
-if [ ! -n "${WIRELESS_REGDOM}" ]; then
+if [[ ! -n ${WIRELESS_REGDOM} ]]; then
   # Get the current timezone
-  if [ -e "/etc/localtime" ]; then
+  if [[ -e "/etc/localtime" ]]; then
     TIMEZONE=$(readlink -f /etc/localtime)
     TIMEZONE=${TIMEZONE#/usr/share/zoneinfo/}
 
@@ -15,12 +15,12 @@ if [ ! -n "${WIRELESS_REGDOM}" ]; then
     COUNTRY="${TIMEZONE%%/*}"
 
     # If we don't have a two letter country, get it from the timezone table
-    if [[ ! "$COUNTRY" =~ ^[A-Z]{2}$ ]] && [ -f "/usr/share/zoneinfo/zone.tab" ]; then
+    if [[ ! $COUNTRY =~ ^[A-Z]{2}$ ]] && [[ -f /usr/share/zoneinfo/zone.tab ]]; then
       COUNTRY=$(awk -v tz="$TIMEZONE" '$3 == tz {print $1; exit}' /usr/share/zoneinfo/zone.tab)
     fi
 
     # Check if we have a two letter country code
-    if [[ "$COUNTRY" =~ ^[A-Z]{2}$ ]]; then
+    if [[ $COUNTRY =~ ^[A-Z]{2}$ ]]; then
       # Append it to the wireless-regdom conf file that is used at boot
       echo "WIRELESS_REGDOM=\"$COUNTRY\"" | sudo tee -a /etc/conf.d/wireless-regdom >/dev/null