The examples section of tar(1) contains the following: tar -xzf foo.tar.gz blah.txt extract the file blah.txt from foo.tar.bz2 (bz2 should obviously be gz). Trivial patch to fix this typo is attached.
Created attachment 131634 [details] tar-1.15-1-mantypo.patch
fixed in tar-1.15.90-3