There's an even more obscure Unix compression tool of the same vintage as pack. While pack originated in USG Unix (System V and its predecessors), the early BSD

There's an even more obscure Unix compression tool of the same vintage as pack. While pack originated in USG Unix (System V and its predecessors), the early BSD releases contained a program called "compact" which used adaptive Huffman coding. According to the creator of compress [0], compact had a comparable compression ratio to pack but took six times as long to run. The original versions of both can be found on the Unix Tree [1] which I've found to generally be an incredible resource/time-sink. [0] https://groups.google.com/d/msg/net.sources/fonve4JCDpQ/39VkTFQV7ScJ https://groups.google.com/d/msg/net.sources/fonve4JCDpQ/39Vk... [1] http://www.tuhs.org/cgi-bin/utree.pl http://www.tuhs.org/cgi-bin/utree.pl