Thanks for the prompt response. I got another error saying cant open vz. After searching online, it seems like the suffix -z is for gzip. Is that automatically installed in xterminal, or do I have to download that. I apologize if this seems so elementary to you. Like i mentioned, this is my first time doing this, and I love Angry Birds!!!
root tar xzvf /home/user/MyDocs/cag_level_pack.tar.gz
root mkdir /home/opt/rovio/angrybirds/data/levels/pack2 cp mypack/* -R /home/opt/rovio/angrybirds/data/levels/pack2
root rm -r mypack