Mailinglist Archive: opensuse (4631 mails)

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Re: [opensuse] tar
  • From: Ken Jennings <ken_jennings@xxxxxxxxxxxxx>
  • Date: Sun, 21 Jan 2007 22:05:59 -0500
  • Message-id: <200701212205.59384.ken_jennings@xxxxxxxxxxxxx>
On Sunday 21 January 2007 20:04, John Meyer wrote:
> And while we're at it, let's see what the -9 does:
>
> before adding -9 to the script:
> total 44523
> -rw-r--r-- 1 jmeyer users 44065843 2007-01-21 18:01 Pictures.tar.gz
> jmeyer@linux-1u45:~/backups> backupfiles.sh
> After adding -9
> jmeyer@linux-1u45:~/backups> ls -al
> total 44528
> -rw-r--r-- 1 jmeyer users 44066020 2007-01-21 18:01 Pictures.tar.gz

Photos/graphics data often compresses poorly. Most image formats already
include some kind of compression, so they are not likely to compress any
further. Text and object files tend to compress a little better.

Here's what the man page says about the gzip compression levels:

-# --fast --best
Regulate the speed of compression using the specified digit #, where -1 or
--fast indicates the fastest compression method (less compression) and -9
or --best indicates the slowest compression method (best compression). The
default compression level is -6 (that is, biased towards high compression at
expense of speed).

This is a directory containing a lot of source code compressed with various
gzip compression levels:

-rw-r--r-- 1 kenjen users 247813 2007-01-21 21:46 csv1.tar.gz
-rw-r--r-- 1 kenjen users 185071 2007-01-21 21:46 csv6.tar.gz
-rw-r--r-- 1 kenjen users 182500 2007-01-21 21:41 csv9.tar.gz
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