untar filel .tar.gz
tar xvfz <filename.tar.gz>
untar tgz
tar zxvf <filename.tgz>
untar tar.bz2
tar xvjf <filename.tar.bz2>
or
bunzip2 <filename.tar.bz2>
then
tar xf <filename.tar>
tar xvfz <filename.tar.gz>
untar tgz
tar zxvf <filename.tgz>
untar tar.bz2
tar xvjf <filename.tar.bz2>
or
bunzip2 <filename.tar.bz2>
then
tar xf <filename.tar>