| -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 |
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