merge last two lines because it is more reliable

We might not have a shell again after the long final badblocks call:
we might have lost the original terminal, network might have cut us
off, etc. By doing this in a single pipeline, we make sure the
shutdown actually gets called.

tsa/howto/retire-a-host.mdwn

@@ -75,10 +75,9 @@ This will take a long time. When you return:
 
         sync
 
- 7. wipe the remaining disk (note the dangerous `-f`):
-
-        badblocks -w -s -v -p 2 -f /dev/sda
-
- 8. shut down the system:
+ 7. wipe the remaining disk (note the dangerous `-f`) and shutdown:
 
+        badblocks -w -s -v -p 2 -f /dev/sda ; \
+        echo "SHUTTING DOWN FOREVER IN ONE MINUTE" ; \
+        sleep 60 ; \
         echo o > /proc/sysrq-trigger