fix changing directory in start_global_shell.sh (#25)

* fix changing directory in start_global_shell.sh

* add success message

Author: master-hax

scripts/start_global_shell.sh

@@ -6,11 +6,8 @@
 # Usage: ./start_global_shell.sh
 ################################################################################
 
-# TODO: return to current directory
-# TODO: display success message
-
 if [ "$(readlink /proc/self/ns/mnt)" != "$(readlink /proc/1/ns/mnt)" ]; then
-  nsenter -t 1 -m -- /bin/sh
+  nsenter -t 1 -m -- /bin/sh -c "cd $PWD && echo 'now running in global mount namespace' && /bin/sh"
 else
   echo 'already running in global mount namespace'
 fi