compress[options] [files]
Reduce the size of one or more files using adaptive Lempel-Ziv coding,
and move to file.Z. Restore with uncompress
or zcat.
nLimit the number of bits in coding to n; n is 9-16,
and 16 is the default. A lower n produces a larger,
less densely compressed file.
Write to the standard output (do not change files).
Compress unconditionally; i.e., do not prompt before overwriting files.
Print the resulting percentage of reduction for files.