ack -o "(?<=href=[\"'])https?://\w.*?(?=['\"])" --php wp-admin/ --no-filename | sort | uniq -c | sort -nr

wp-admin-links.txt

  44 https://wordpress.org/support/
  10 https://codex.wordpress.org/Version_%1$s
   6 https://wordpress.org/support/forum/multisite/
   3 https://codex.wordpress.org/Network_Admin_Sites_Screen
   3 https://codex.wordpress.org/Changing_File_Permissions
   2 https://codex.wordpress.org/Using_Themes
   2 https://codex.wordpress.org/Tools_Network_Screen
   2 https://codex.wordpress.org/Network_Admin_Users_Screen
   2 https://codex.wordpress.org/Media_Library_Screen
   2 https://codex.wordpress.org/Media_Add_New_Screen#Edit_Media
   2 https://codex.wordpress.org/Keyboard_Shortcuts
   2 https://codex.wordpress.org/Create_A_Network
   2 https://codex.wordpress.org/Administration_Screens#Comments
   2 http://gmpg.org/xfn/
   1 https://www.fsf.org/
   1 https://wordpress.org/support/plugin/<?php echo $api->slug; ?>/reviews/?filter=<?php echo $key; ?>
   1 https://wordpress.org/
   1 https://make.wordpress.org/core/2017/11/01/improvements-to-the-customize-js-api-in-4-9/
   1 https://make.wordpress.org/core/2017/10/30/mediaelement-upgrades-in-wordpress-4-9/
   1 https://make.wordpress.org/core/2017/10/22/code-editing-improvements-in-wordpress-4-9/
   1 https://make.wordpress.org/core/2017/10/15/improvements-for-roles-and-capabilities-in-4-9/
   1 https://gravatar.com
   1 https://codex.wordpress.org/Writing_a_Plugin
   1 https://codex.wordpress.org/WordPress_Backups
   1 https://codex.wordpress.org/Widgetizing_Themes
   1 https://codex.wordpress.org/Using_Themes#Adding_New_Themes
   1 https://codex.wordpress.org/Using_Permalinks
   1 https://codex.wordpress.org/Users_Your_Profile_Screen
   1 https://codex.wordpress.org/Users_Screen
   1 https://codex.wordpress.org/Users_Add_New_Screen
   1 https://codex.wordpress.org/Updating_WordPress
   1 https://codex.wordpress.org/Tools_Screen
   1 https://codex.wordpress.org/Tools_Import_Screen
   1 https://codex.wordpress.org/Tools_Export_Screen
   1 https://codex.wordpress.org/Theme_Development
   1 https://codex.wordpress.org/Template_Tags
   1 https://codex.wordpress.org/Settings_Writing_Screen
   1 https://codex.wordpress.org/Settings_Reading_Screen
   1 https://codex.wordpress.org/Settings_Permalinks_Screen
   1 https://codex.wordpress.org/Settings_Media_Screen
   1 https://codex.wordpress.org/Settings_General_Screen
   1 https://codex.wordpress.org/Settings_Discussion_Screen
   1 https://codex.wordpress.org/Roles_and_Capabilities
   1 https://codex.wordpress.org/Revision_Management
   1 https://codex.wordpress.org/Posts_Tags_Screen
   1 https://codex.wordpress.org/Posts_Screen
   1 https://codex.wordpress.org/Posts_Categories_Screen
   1 https://codex.wordpress.org/Posts_Add_New_Screen
   1 https://codex.wordpress.org/Post_Formats#Supported_Formats
   1 https://codex.wordpress.org/Plugins_Editor_Screen
   1 https://codex.wordpress.org/Plugins_Add_New_Screen
   1 https://codex.wordpress.org/Pages_Screen#Editing_Individual_Pages
   1 https://codex.wordpress.org/Pages_Screen
   1 https://codex.wordpress.org/Pages_Add_New_Screen
   1 https://codex.wordpress.org/Nginx
   1 https://codex.wordpress.org/Network_Admin_Updates_Screen
   1 https://codex.wordpress.org/Network_Admin_Themes_Screen
   1 https://codex.wordpress.org/Network_Admin_Settings_Screen
   1 https://codex.wordpress.org/Network_Admin
   1 https://codex.wordpress.org/Media_Add_New_Screen
   1 https://codex.wordpress.org/Managing_Plugins#Plugin_Management
   1 https://codex.wordpress.org/Links_Screen
   1 https://codex.wordpress.org/Links_Link_Categories_Screen
   1 https://codex.wordpress.org/Links_Add_New_Screen
   1 https://codex.wordpress.org/Glossary#Character_set
   1 https://codex.wordpress.org/Formatting_Date_and_Time
   1 https://codex.wordpress.org/Embeds
   1 https://codex.wordpress.org/Editing_Files
   1 https://codex.wordpress.org/Dashboard_Updates_Screen
   1 https://codex.wordpress.org/Dashboard_Screen
   1 https://codex.wordpress.org/Dashboard_My_Sites_Screen
   1 https://codex.wordpress.org/Comment_Spam
   1 https://codex.wordpress.org/Appearance_Widgets_Screen
   1 https://codex.wordpress.org/Appearance_Menus_Screen
   1 https://codex.wordpress.org/Appearance_Header_Screen
   1 https://codex.wordpress.org/Appearance_Background_Screen