Pretty dirty solution, but: cat list| cut -d ' ' -f 4 | xargs -I{} echo "https://news.ycombinator.com/item?id={}" https://news.ycombinator.com/item?id={}" | pa

Pretty dirty solution, but: cat list| cut -d ' ' -f 4 | xargs -I{} echo "https://news.ycombinator.com/item?id={}" https://news.ycombinator.com/item?id={}" | paste list - | cut -d ' ' -f 5-