Read hosts from standard input and look up their IP addresses.
▶ cat hosts.txt | host2ip
google.com 172.217.12.174
google.com 2607:f8b0:4006:81a::200e
bing.com 13.107.21.200
bing.com 204.79.197.200
bing.com 2620:1ec:c11::200
apple.com 17.172.224.47
apple.com 17.178.96.59
apple.com 17.142.160.59
go get github.com/sunny0day/host2ip