gzip has been ported to the Mac by Jose Gutierrez as MacGzip. I do not maintain MacGzip myself, so please report problems with MacGzip to Jose Gutierrez, unless the problem is generic and can be reproduced with gzip on other systems. MacGzip is available by ftp in mac.archive.umich.edu:/mac/util/compression/macgzip*.cpt.hqx. (The current version as of 15 September 1994 is macgzip0.22.cpt.hqx but there might be a new version, please check.) Jean-loup Gailly The current version as of 7 June 1998 seems to be 1.0b0; it is available from ftp://wuarchive.wustl.edu/systems/mac/umich.edu/util/compression/ . (The archive is dated 7 October 1995.) G. Roelofs .