working l2tp-over-wwan stick example

pkgs/service-fns/default.nix

@@ -1,6 +1,18 @@
 {writeText}:
 writeText "service-fns.sh" ''
   output() { cat $1/.outputs/$2; }
+  output_word() {
+    set -f
+    local i=1
+    for var in $(cat $1/.outputs/$2); do
+      if test "$i" == "$3" ; then
+        echo $var
+      fi
+      i=$(expr $i + 1)
+    done
+    set +f
+  }
+
   output_path() { echo $(realpath $1/.outputs)/$2; }
   SERVICE_OUTPUTS=/run/services/outputs
   SERVICE_STATE=/run/services/state