Unzipping a .gz file without removing the gzipped file

Here are several alternatives:

• 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
  

Without requiring a temporary file:

 zcat somefile.gz > somefile