Some minor cleanup for final book edits

brobey · brobey · commit 68d6d40d8d6a · 2020-10-10T12:57:33.000-06:00
diff --git a/Chapter4 b/Chapter4
@@ -1 +1 @@
-Subproject commit a0680a85273e9bc7f44a1b8149ca027fcac7b912
+Subproject commit c6507c76e5229249b6559634c6a7dd92250a6c41
diff --git a/Chapter5 b/Chapter5
@@ -1 +1 @@
-Subproject commit 9e31dd257a19dd5a63a89c3414b2448e7fb94b26
+Subproject commit 3844c1f6af9dc874464d1886d464ab7ea25ace9c
diff --git a/Chapter6 b/Chapter6
@@ -1 +1 @@
-Subproject commit 682cbde9c0a7ba4aefd6352f5b10f1ee1c340167
+Subproject commit dd181a67a792fe9ed1b72aaa953e7372b1b1d94a
diff --git a/docker_cleanup.sh b/docker_cleanup.sh
@@ -0,0 +1,6 @@
+#!/bin/sh
+docker kill $(docker ps -q)
+docker rm -f $(docker ps -a -q)
+docker rmi -f $(docker images -q -f dangling=true)
+docker rmi -f $(docker images -q)
+
