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ZFORCE(1) General Commands Manual ZFORCE(1)

force gzip files to have a .gz suffix

zforce file ...

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.

compress(1), gzip(1)

zforce overwrites existing files without warning.
May 31, 2007 OpenBSD-6.0