Kristopher Lagraff

This plugin enables the short link menu item to display in the admin toolbar. This feature was removed from 
version 3.3 by default.

Reenable Shortlink Item In Admin Toolbar

This plugin will display the shortlink menu item in the admin toolbar.

harman79

If you like working with shortlinks, then this plugin is for you!
<ul>
<li>Creates an extra column displaying shortlinks in the main post, page, categories and media list screens; for the media list screen it also adds the file URL info.</li>
<li>Adds an optional button next to each shortlink. When this button is clicked the shortlink is automatically copied to the clipboard.</li>
<li>Adds an inner post/page shortlink button, just as it was for WordPress versions earlier then 4.4.</li>
<li>Works for built in and custom post types and taxonomies. </li>
<li>Provides settings page to customise basic appearance/functionality features.</li>
</ul>
Unless you have Javascript disabled, the auto-copy function is supported by all major browsers, apart from Safari, which does not support the execCommand copy function of Javascript.

Shortlink & File URL Column

Adds a shortlink column in post/page, taxonomy and media manage screens. Also retrieves inner post shortlink button as for WP earlier than 4.4.

Reenable Shortlink Item In Admin Toolbar vs Shortlink & File URL Column