zforce : Linux Command Manual

       zforce [ name ...  ]

       zforce  forces  a .gz extension on all gzip files so that gzip will 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, znew, zmore, zgrep, zdiff, gzexe