Extracting the DokuWiki tgz
DokuWiki is distributed in a gzip'ed tar archive, often called tgz or tarball. This is a very common UNIX archiving format similar to the popular ZIP format many Windows user probably know. Here is how to extract such a file in different Operating Systems.
Unix/Linux Users
Probably all of you can use the following:
tar -xzvf dokuwiki-YYYY-MM-DD.tgz
This will extract the tarball in the current directory.
On some non-Linux systems you might find the GNU tar program under the name gtar, therefore use:
gtar -xzvf dokuwiki-YYYY-MM-DD.tgz
If this does not work for you because you are on some proprietary Unix system the following should work but you probably know that better anyway 
cat dokuwiki-YYYY-MM-DD.tgz |gzip -d | tar -xf -
Windows Users
Windows-Users may need to rename the file from dokuwiki-YYYY-MM-DD.tgz to dokuwiki-YYYY-MM-DD.tar.gz to make their archive tool recognize the file format correctly (See 209).
To extract the tarball you need an extraction tool. There are hundreds of different programs available and there is a good chance that you already have one. If not, here is a short selection:
Mac Users
Usually double-clicking on the .tgz file will extract it. Since Mac OS X has a unixoid system under the hood, the description for Linux/Unix above works in the Terminal.app. StuffIt Expander version 8.02 and higher handles .tgz correctly. Earlier versions of Stuffit Expander may as well.
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