Gznew
recompresses files from .Z (compress) format to .gz (gzip) format.
If you want to recompress a file already in gzip format, rename the file
to force a .Z extension then apply gznew.
OPTIONS
-f
Force recompression from .Z to .gz format even if a .gz file already exists.
-t
Tests the new files before deleting originals.
-v
Verbose. Display the name and percentage reduction for each file compressed.
-9
Use the slowest compression method (optimal compression).
-P
Use pipes for the conversion to reduce disk space usage.
-K
Keep a .Z file when it is smaller than the .gz file