(gzip.info) Advanced usage

 
 Advanced usage
 **************
 
    Multiple compressed files can be concatenated. In this case,
 `gunzip' will extract all members at once. If one member is damaged,
 other members might still be recovered after removal of the damaged
 member. Better compression can be usually obtained if all members are
 decompressed and then recompressed in a single step.
 
    This is an example of concatenating `gzip' files:
 
      gzip -c file1  > foo.gz
      gzip -c file2 >> foo.gz
 
    Then
 
      gunzip -c foo
 
    is equivalent to
 
      cat file1 file2
 
    In case of damage to one member of a `.gz' file, other members can
 still be recovered (if the damaged member is removed). However, you can
 get better compression by compressing all members at once:
 
      cat file1 file2 | gzip > foo.gz
 
    compresses better than
 
      gzip -c file1 file2 > foo.gz
 
    If you want to recompress concatenated files to get better
 compression, do:
 
      zcat old.gz | gzip > new.gz
 
    If a compressed file consists of several members, the uncompressed
 size and CRC reported by the `--list' option applies to the last member
 only. If you need the uncompressed size for all members, you can use:
 
      zcat file.gz | wc -c
 
    If you wish to create a single archive file with multiple members so
 that members can later be extracted independently, use an archiver such
 as `tar' or `zip'. GNU `tar' supports the `-z' option to invoke `gzip'
 transparently. `gzip' is designed as a complement to `tar', not as a
 replacement.
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