Gzip
and
gunzip
perform data compression and decompression
compatible with the Unix
gzip
file format,
which uses a hybrid Lempel-Ziv 1977 and Huffman compression algorithm
called `deflate'.
If no arguments are given
gzip
compresses each
file
replacing it by a file of the same
name with the a
.gz
suffix appended.
If no files are given, standard input
and standard output are used.
Level
is a single decimal digit between 1 and 9;
higher numbers give better compression.
The default
level
is 6.
The
-v
option causes
gzip
to report the compression ratio of each file that
it compresses.
Gunzip
performs the opposite operation to
gzip;
each
file
(which must have a
.gz
suffix) is uncompressed, and replaced
by a file of the same name with the
.gz
suffix removed. If no files are given,
standard input and standard output are used.