TAR extract in particular folder of SAP Application Server

Hi *,

I have a requirement to extract a TAR file to a particular folder of SAP Application Server (unix).

I have tried with CALL system command.:

CONCATENATE 'cd' wpv_dir_target ';'

              'tar xvf' wpv_file 

                                   INTO wlv_cmd_unix SEPARATED BY space.

  CALL 'SYSTEM' ID 'COMMAND' FIELD wlv_cmd_unix

                ID 'TAB'     FIELD wlt_system_list-*sys*.

But it does not work.

I have also crated a Command in SM69 called Z_TAR. I use that with SXPG_COMMAND_EXECUTE
I use it like this : z_tar -xvf path+file_name -C destination_directory_path

This gives me error.
If I try like this, z_tar -xvf path+file_name, then It gives the list of files of TAR files but I could not figure out where it extracts the files.

Please help me.

Thanks

Chandler Bing