Man page 1 : zforce

zforce - force a '.gz' extension on all gzip files

zforce [ name ... ]

zforceforces a .gz extension on all gzipfiles so that gzipwill not compress them twice. This can be useful for files with names truncated after a file transfer. On systems with a 14 char limitation on file names, the original name is truncated to make room for the .gz suffix. For example, 12345678901234 is renamed to 12345678901.gz. A file name such as foo.tgz is left intact.

gzip(1), znew(1), zmore(1), zgrep(1), zdiff(1), gzexe(1)