The bzip2 and bunzip2 utilities are newer than gzip and gunzip and are not as common yet, but they are rapidly gaining popularity. The bzip2 utility is capable of greater compression ratios than gzip. Therefore, a bzip2 file can be 10-20% smaller than a gzip version of the same file. Usually, files that have been compressed by bzip2 will have a .bz2 extension.
To uncompress a bzip2 file, execute the following command:
The result of this operation is a file called /tmp/kernel-2.6.15.tar. By default, bunzip2 will delete the /tmp/kernel-2.6.15.tar.bz2 file. You can now extract the contents with
tar xvf /tmp/kernel-2.6.15.tar