gzopen(+File,
+Mode, -Stream, +Options)Open gzip compatible File for reading or writing. If a
file is opened in =append= mode, a new gzip image will be added to the
end of the file. The gzip standard defines that a file can hold multiple
gzip images and inflating the file results in a concatenated stream of
all inflated images. Options are passed to open/4
and zopen/3.
Default format is
gzip.