Question: how to unzip gz on unix?
Answer: Give gunzip the --keep option (version 1.6 or later) -k --keep. Keep (don't delete) input files during compression or decompression. gunzip -k file.gz.
Pass the file to gunzip as stdin gunzip < file.gz > file.
Use zcat (or, on older systems, gzcat ) zcat file.gz > file.