-Acdtrux - what does it mean
 

What have i missed out ?

[root /romtools]# tar -xzf linux-2.6.16-raq4-source.tar.gz -c /usr/src
tar: You may not specify more than one `-Acdtrux' option
Try `tar --help' for more information.

You need to use -C to change directories. -c is to create a tar file, which obviously conflicts with -x for extracting from one. Like it says, run "tar --help" for more information, or look at the man page with "man tar".

Many thanks

Read the help file and discovered that '-c' '-C' are not the same.

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i m try extraxt this download

http://heasarc.gsfc.nasa.gov/FTP/ret...wse-196111.tar.

when i tape tar -zf <bame.tar> i m receive this message too

tar: You must specify one of the `-Acdtrux' or `--test-label' options
Try `tar --help' or `tar --usage' for more information.

i m in ubuntu 12.* now, bur in slackware thre no problem

The command switch for extraction with tar is x, for creating a tar file is c, but you have neither in your command so tar does not know what to do and exits.
Your command should look like