Цитата:

Files can be compressed to save disk space using compress, which is obsolete and shouldn't be used any more, or gzip:
$ compress <file>
$ gzip <file>

that creates a compressed file with extension .Z (compress) or .gz (gzip). These programs don't make archives, but compress files individually. To decompress, use:

$ compress -d <file.Z>
$ gzip -d <file.gz>