Add an extra column for a specific Custom Post Type. Echo a shortcode, ready to copy-paste by the user.

add-shortcode-column.php

<?php
/**
 * Adds a shortcode column for a CPT
 *
 * In this example, my CPT's slug is ISO_SLIDER
 *
 * Uses
 * http://codex.wordpress.org/Plugin_API/Filter_Reference/manage_$post_type_posts_columns
 * http://codex.wordpress.org/Plugin_API/Action_Reference/manage_$post_type_posts_custom_column
 *
 */


/**
 * This is the "Tell WordPress to add an extra column when displaying the ISO_SLIDER CPT
 */

add_filter( 'manage_ISO_SLIDER_posts_columns', 'set_custom_edit_iso_slider_columns' );
function set_custom_edit_iso_slider_columns( $columns ) {

	/**
	 * Add a column with a slug of 'iso_slider_shortcode'
	 */
	$columns['iso_slider_shortcode'] = __( 'Shortcode', 'your-textdomain' );

	return $columns;
}

/**
 * This is the "Display what I want in the column" bit
 */
add_action( 'manage_ISO_SLIDER_posts_custom_column', 'iso_display_slider_columns', 10, 2 );
function iso_display_slider_columns( $column, $post_id ) {
	switch ( $column ) {
		/*
		 * If we're currently looking at the 'iso_slider_shortcode', echo 'stuff'
		 */
		case 'iso_slider_shortcode' :
			if ( ! empty( $url ) ) {
				echo '<input type="text" class="shortcode-in-list-table wp-ui-text-highlight code" value=\'[slider_shortcode id="' . $post_id . '"]\' readonly="readonly" onfocus="this.select();" size="50">';
			}
			break;

	}
}