Ask HN: What are some well designed CLI apps?

The original /bin/true and /bin/false, if the claim in http://www.classiccmp.org/pipermail/cctech/2016-July/019657.... ("the original implementation of /bin/true was a zero-length file, while /bin/false worked by not existing at al") is true.

gnu hello, a hello world that, in over 7500 bytes of C, supports --help, --version, a --traditional flag that changes "Hello, world!" to "hello, world", --greeting to completely change the greeting, and localization, and correctly sets its exit code if writing of the message fails.

apps? not sure that is the right term. I'd much rather see the word program. apps is a thing of the various phone providers (apple, android)

git's design is exceptional.