znew

Recompress files from .Z to gzip format. More information: https://manned.org/znew.

• Recompress a file from .Z to gzip format:

znew path/to/file1.Z

• Recompress multiple files and display the achieved size reduction % per file:

znew -v path/to/file1.Z path/to/file2.Z …

• Recompress a file using the slowest compression method (for optimal compression):

znew -9 path/to/file1.Z

• Recompress a file, [K]eeping the .Z file if it is smaller than the gzip file:

znew -K path/to/file1.Z