o doesnt work

howto/retire-a-host.md

@@ -168,10 +168,13 @@ When you return:
 
  7. wipe the remaining disk and shutdown:
 
-        nwipe --autonuke --method=random --verify=off /dev/sda ; \
-        echo "SHUTTING DOWN FOREVER IN ONE MINUTE" ; \
+        # hit control-a control-g to enable the bell in screen
+        nwipe --autonuke --method=random --verify=off /dev/nbd0 ; \
+        printf "SHUTTING DOWN FOREVER IN ONE MINUTE\a\n" ; \
         sleep 60 ; \
-        echo o > /proc/sysrq-trigger
+        echo o > /proc/sysrq-trigger ; \
+        sleep 60 ; \
+        echo b > /proc/sysrq-trigger ; \
 
 A few tricks if nothing works in the shell which might work in a case
 of an emergency: