post-images.sh

#!/bin/bash

echo "post_id,post_title,image_path";

while read -r post_row
do

	# --format=csv always has a header
	if [[ "ID,post_title" == $post_row ]]; then
		continue;
	fi;
	post_id=${post_row%,*}
	post_title=${post_row#*,}
	echo -n $post_row',';

	thumbid=$(wp post meta get $post_id _thumbnail_id)
	if [ ! -z $thumbid ]; then
		wp post meta pluck $thumbid _wp_attachment_metadata file
	else
		echo '';
	fi;

done < <(wp --skip-plugins --skip-themes post list --post_type=page --fields=ID,post_title --format=csv)

1. get relevant posts (L32)
2. get post's featured image (L16)
3. if image, get image's file path else blank (L17-21)
4. output as csv

This uses a while loop because of the post titles being fetched... spaces throw off a for loop.