In order to save network bandwidth and disk space, submissions are compressed. The archive uses the GNU gzip utility, which is free software.
See our detailed utilities help for instructions on obtaining gzip.
Along with gzip you will always find gunzip, which decompresses compressed files; gunzip can uncompress files in several different compression formats.
Gzipped files usually have a .gz extension.
To gzip a file on the Unix command line do the following:
> gzip filename
This will create a compressed file called filename.gz and delete the
original uncompressed version. To uncompress the file, do
> gunzip filename.gz