Deleting all cookbooks example - very simple tip for me? or YOU?

vagrant@chefws:~/chef-repo$ knife cookbook bulk delete ".*"
All versions of the following cookbooks will be deleted:

apache2              iis                  windows           
apt                  my_cookbook          wordpress         
aws                  mysql                xfs               
build-essential      mysql-chef_gem       xml               
chef-sugar           openssl              yum               
chef_handler         php                  yum-epel          
database             postgresql           yum-mysql-community

Do you really want to delete these cookbooks? (Y/N)Y

Deleted cookbook  aws                       [2.3.0]
Deleted cookbook  yum-mysql-community       [0.1.10]
Deleted cookbook  chef-sugar                [2.0.0]
Deleted cookbook  xml                       [1.2.6]
Deleted cookbook  mysql-chef_gem            [0.0.2]
Deleted cookbook  openssl                   [2.0.0]
Deleted cookbook  yum-epel                  [0.4.0]
Deleted cookbook  postgresql                [3.4.1]
Deleted cookbook  iis                       [2.1.2]
Deleted cookbook  build-essential           [2.0.4]
Deleted cookbook  mysql                     [5.3.6]
Deleted cookbook  php                       [1.4.6]
Deleted cookbook  database                  [2.2.0]
Deleted cookbook  apache2                   [0.1.0]
Deleted cookbook  yum                       [3.2.2]
Deleted cookbook  xfs                       [1.1.0]
Deleted cookbook  apt                       [2.4.0]
Deleted cookbook  chef_handler              [1.1.6]
Deleted cookbook  wordpress                 [0.8.1]
Deleted cookbook  windows                   [1.33.1]
Deleted cookbook  my_cookbook               [0.1.0]
vagrant@chefws:~/chef-repo$

vagrant@chefws:~/chef-repo$ knife cookbook list