use awk a bit smarter

buildAdBlocklist.sh

@@ -1,6 +1,13 @@
-#°/bin/bash
-ADLISTDIR=adlists
-for adfile in $(ls $ADLISTDIR); do
-  grep -v '^#' < $ADLISTDIR/$adfile | grep -v '^$' | awk '{if (0 < match($0, "\t") || 0 < index($0, " ")) {split($0,b," "); print b[2]} else print $0}' | grep -v '^localhost$' | grep -v '^local$' | grep -v '^localhost.localdomain$' | grep -v '^ip6-localnet$' | grep -v '^ip6-localhost$' | grep -v '^$' | while read blockedAddress; do echo "127.0.0.1 $blockedAddress"; done >> block.list
-done
-
+#!/bin/bash
+awk -F'[\t ]+' '{
+  if (!match($0, /^\s*(#|$)/)) {
+    if (NF>=2 && length($2)) {
+      host=$2
+    } else {
+      host=$1
+    }
+    if (!match(host, /^(localhost|local|localhost.localdomain|ip6-localnet|ip6-localhost$)$/)) {
+      print "127.0.0.1 " host
+    }
+  }
+}' adlists/* > block.list

retrieveAdBlocklists.sh

@@ -1,4 +1,3 @@
 #!/bin/bash
-while read p; do
-  echo "$p" | awk '{split($0,a,"|"); system("curl -s " a[2] " > adlists/"a[1])}'
-done < adfilelist.txt
+rm -rf adlists/*
+awk -F'|' '{system("wget -q -O adlists/" $1 " " $2)}' adfilelist.txt