Address feedback around printf & exec

scripts/install-darwin-multi-user.sh

@@ -199,7 +199,7 @@ __sudo() {
 
     echo "I am executing:"
     echo ""
-    echo "    $ sudo $cmd"
+    printf "    $ sudo %s\n" "$cmd"
     echo ""
     echo "$expl"
     echo ""

scripts/install-nix-from-closure.sh

@@ -30,7 +30,7 @@ if [ "$(uname -s)" = "Darwin" ]; then
     fi
 
     printf '\e[1;31mSwitching to the Multi-User Darwin Installer\e[0m\n'
-    "$self/install-darwin-multi-user"
+    exec "$self/install-darwin-multi-user"
     exit 0
 fi