Custom module in drupal 8, tab not created in admin section -

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i created custom module in drupal 8. module should create tab in admin/content. unfortunately tab not display in admin/content section. while can able access module. link access module 'localhost/demo/admin/content/book'

here code:- book.routing.yml 

# book.routing.yml snippet book.admin:   path: '/admin/content/book'   defaults:      _form: '\drupal\book\form\bookform'     _title: 'books'   requirements:     _permission: 'book access'

book.links.menu.yml

# book.links.menu.yml snippet book.admin:   route_name: book.admin   title: books   base_route: system.admin_content

for more information attaching screenshot, want tab
expecting 1

enter image description here

you should rename file

book.links.task.yml

because want "task" of content instead of real menu link. here's great explanation , guide how create custom modules:

http://www.sitepoint.com/build-drupal-8-module-routing-controllers-menu-links/

note of file namings outdated (e.g. "menu_links"), general idea/structure of module still explained.


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