How to delete a single post using wp cli in command line?

Please read the docs. It’s wp post delete POST-ID.

# Delete post skipping trash
$ wp post delete 123 --force
Success: Deleted post 123.

# Delete all pages
$ wp post delete $(wp post list --post_type="page" --format=ids)
Success: Trashed post 1164.
Success: Trashed post 1186.

# Delete all posts in the trash
$ wp post delete $(wp post list --post_status=trash --format=ids)
Success: Deleted post 1268.
Success: Deleted post 1294.

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To get posts by title or meta value use wp post list and pass the output to wp post delete like shown above.

Get posts by title or meta value:

• WP-CLI How to generate a list of posts with corresponding meta values
• Using wp-cli can I not query pages by their title?