Manual Pages  — ZFORCE

The zforce utility renames gzip(1) files to have a '.gz' suffix, so that gzip(1) will not compress them twice. This can be useful if file names were truncated during a file transfer. Files that have an existing '.gz', '-gz', '_gz', '.tgz' or '.taz' suffix, or that have not been compressed by gzip(1), are ignored.

gzip(1)