znew
(1)recompress .Z files to .gz files
znew [ -ftv9PK] [ name.Z ... ]
Options
6-fForce recompression from .Z to .gz format even if a .gz file already exists.
-tTests the new files before deleting originals.
-vVerbose. Display the name and percentage reduction for each file compressed.
-9Use the slowest compression method (optimal compression).
-PUse pipes for the conversion to reduce disk space usage.
-KKeep a .Z file when it is smaller than the .gz file; implies -t.