CBLT-198:  echo $foo, not cat !

Change-Id: I582c4db535f8d2c964f74b0679e02c660e0e11e9
Reviewed-on: http://review.couchbase.org/34137
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>